diff --git a/docs/about/dev.rst b/docs/about/dev.rst
index 8586d10..309d1dc 100644
--- a/docs/about/dev.rst
+++ b/docs/about/dev.rst
@@ -1,8 +1,7 @@
 .. _dev:
-
-=============
-Code Standard
-=============
+================
+For Developer
+================
 
 Docstring
 ============
diff --git a/examples/dataset_image_workflow/main.py b/examples/dataset_image_workflow/main.py
index 5ac7749..c91981c 100644
--- a/examples/dataset_image_workflow/main.py
+++ b/examples/dataset_image_workflow/main.py
@@ -13,7 +13,7 @@ from learnware.learnware import Learnware
 import time
 
 from learnware.market import instantiate_learnware_market, BaseUserInfo
-from learnware.market import database_ops
+from learnware.market.easy import database_ops
 from learnware.learnware import Learnware
 import learnware.specification as specification
 from learnware.logger import get_module_logger
@@ -168,15 +168,14 @@ def test_search(gamma=0.1, load_market=True):
         user_stat_spec.generate_stat_spec_from_data(X=user_data, resize=False)
         user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": user_stat_spec})
         logger.info("Searching Market for user: %d" % i)
-        sorted_score_list, single_learnware_list, mixture_score, mixture_learnware_list = image_market.search_learnware(
-            user_info
-        )
+        search_result = image_market.search_learnware(user_info)
+        single_result = search_result.get_single_results()
         acc_list = []
-        for idx, (score, learnware) in enumerate(zip(sorted_score_list[:5], single_learnware_list[:5])):
-            pred_y = learnware.predict(user_data)
+        for idx, single_item in enumerate(single_result[:5]):
+            pred_y = single_item.learnware.predict(user_data)
             acc = eval_prediction(pred_y, user_label)
             acc_list.append(acc)
-            logger.info("Search rank: %d, score: %.3f, learnware_id: %s, acc: %.3f" % (idx, score, learnware.id, acc))
+            logger.info("Search rank: %d, score: %.3f, learnware_id: %s, acc: %.3f" % (idx, single_item.score, single_item.learnware.id, acc))
 
         # test reuse (job selector)
         # reuse_baseline = JobSelectorReuser(learnware_list=mixture_learnware_list, herding_num=100)
@@ -186,6 +185,7 @@ def test_search(gamma=0.1, load_market=True):
         # print(f"mixture reuse loss: {reuse_score}")
 
         # test reuse (ensemble)
+        single_learnware_list = [single_item.learnware for single_item in single_result]
         reuse_ensemble = AveragingReuser(learnware_list=single_learnware_list[:3], mode="vote_by_prob")
         ensemble_predict_y = reuse_ensemble.predict(user_data=user_data)
         ensemble_score = eval_prediction(ensemble_predict_y, user_label)
diff --git a/examples/dataset_m5_workflow/main.py b/examples/dataset_m5_workflow/main.py
index 763669d..60ee439 100644
--- a/examples/dataset_m5_workflow/main.py
+++ b/examples/dataset_m5_workflow/main.py
@@ -155,29 +155,28 @@ class M5DatasetWorkflow:
             user_spec.save(user_spec_path)
 
             user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = easy_market.search_learnware(user_info)
-
+            search_result = easy_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
+            multiple_result = search_result.get_multiple_results()
+            
             print(f"search result of user{idx}:")
             print(
-                f"single model num: {len(sorted_score_list)}, max_score: {sorted_score_list[0]}, min_score: {sorted_score_list[-1]}"
+                f"single model num: {len(single_result)}, max_score: {single_result[0].score}, min_score: {single_result[-1].score}"
             )
             loss_list = []
-            for score, learnware in zip(sorted_score_list, single_learnware_list):
-                pred_y = learnware.predict(test_x)
+            for single_item in single_result:
+                pred_y = single_item.learnware.predict(test_x)
                 loss_list.append(m5.score(test_y, pred_y))
             print(
-                f"Top1-score: {sorted_score_list[0]}, learnware_id: {single_learnware_list[0].id}, loss: {loss_list[0]}"
+                f"Top1-score: {single_result[0].score}, learnware_id: {single_result[0].learnware.id}, loss: {loss_list[0]}"
             )
 
-            mixture_id = " ".join([learnware.id for learnware in mixture_learnware_list])
-            print(f"mixture_score: {mixture_score}, mixture_learnware: {mixture_id}")
-            if not mixture_learnware_list:
-                mixture_learnware_list = [single_learnware_list[0]]
+            if len(multiple_result) > 0:
+                mixture_id = " ".join([learnware.id for learnware in multiple_result[0].learnwares])
+                print(f"mixture_score: {multiple_result[0].score}, mixture_learnware: {mixture_id}")
+                mixture_learnware_list = multiple_result[0].learnwares
+            else:
+                mixture_learnware_list = [single_result[0].learnware]
 
             reuse_job_selector = JobSelectorReuser(learnware_list=mixture_learnware_list, use_herding=False)
             job_selector_predict_y = reuse_job_selector.predict(user_data=test_x)
diff --git a/examples/dataset_pfs_workflow/main.py b/examples/dataset_pfs_workflow/main.py
index 784c383..74c4da5 100644
--- a/examples/dataset_pfs_workflow/main.py
+++ b/examples/dataset_pfs_workflow/main.py
@@ -152,29 +152,28 @@ class PFSDatasetWorkflow:
             user_spec.save(user_spec_path)
 
             user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = easy_market.search_learnware(user_info)
-
+            search_result = easy_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
+            multiple_result = search_result.get_multiple_results()
+            
             print(f"search result of user{idx}:")
             print(
-                f"single model num: {len(sorted_score_list)}, max_score: {sorted_score_list[0]}, min_score: {sorted_score_list[-1]}"
+                f"single model num: {len(single_result)}, max_score: {single_result[0].score}, min_score: {single_result[-1].score}"
             )
             loss_list = []
-            for score, learnware in zip(sorted_score_list, single_learnware_list):
-                pred_y = learnware.predict(test_x)
+            for single_item in single_result:
+                pred_y = single_item.learnware.predict(test_x)
                 loss_list.append(pfs.score(test_y, pred_y))
             print(
-                f"Top1-score: {sorted_score_list[0]}, learnware_id: {single_learnware_list[0].id}, loss: {loss_list[0]}, random: {np.mean(loss_list)}"
+                f"Top1-score: {single_result[0].score}, learnware_id: {single_result[0].learnware.id}, loss: {loss_list[0]}, random: {np.mean(loss_list)}"
             )
 
-            mixture_id = " ".join([learnware.id for learnware in mixture_learnware_list])
-            print(f"mixture_score: {mixture_score}, mixture_learnware: {mixture_id}")
-            if not mixture_learnware_list:
-                mixture_learnware_list = [single_learnware_list[0]]
+            if len(multiple_result) > 0:
+                mixture_id = " ".join([learnware.id for learnware in multiple_result[0].learnwares])
+                print(f"mixture_score: {multiple_result[0].score}, mixture_learnware: {mixture_id}")
+                mixture_learnware_list = multiple_result[0].learnwares
+            else:
+                mixture_learnware_list = [single_result[0].learnware]
 
             reuse_job_selector = JobSelectorReuser(learnware_list=mixture_learnware_list, use_herding=False)
             job_selector_predict_y = reuse_job_selector.predict(user_data=test_x)
diff --git a/examples/dataset_text_workflow/main.py b/examples/dataset_text_workflow/main.py
index 72de04e..c5715e7 100644
--- a/examples/dataset_text_workflow/main.py
+++ b/examples/dataset_text_workflow/main.py
@@ -199,31 +199,34 @@ class TextDatasetWorkflow:
             user_stat_spec.generate_stat_spec_from_data(X=user_data)
             user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETextSpecification": user_stat_spec})
             logger.info("Searching Market for user: %d" % (i))
-            sorted_score_list, single_learnware_list, mixture_score, mixture_learnware_list = text_market.search_learnware(
-                user_info
-            )
-
+            
+            search_result = text_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
+            multiple_result = search_result.get_multiple_results()
+            
             print(f"search result of user{i}:")
             print(
-                f"single model num: {len(sorted_score_list)}, max_score: {sorted_score_list[0]}, min_score: {sorted_score_list[-1]}"
+                f"single model num: {len(single_result)}, max_score: {single_result[0].score}, min_score: {single_result[-1].score}"
             )
 
-            l = len(sorted_score_list)
+            l = len(single_result)
             acc_list = []
             for idx in range(l):
-                learnware = single_learnware_list[idx]
-                score = sorted_score_list[idx]
+                learnware = single_result[idx].learnware
+                score = single_result[idx].score
                 pred_y = learnware.predict(user_data)
                 acc = eval_prediction(pred_y, user_label)
                 acc_list.append(acc)
             print(
-                f"Top1-score: {sorted_score_list[0]}, learnware_id: {single_learnware_list[0].id}, acc: {acc_list[0]}"
+                f"Top1-score: {single_result[0].score}, learnware_id: {single_result[0].learnware.id}, acc: {acc_list[0]}"
             )
             
-            mixture_id = " ".join([learnware.id for learnware in mixture_learnware_list])
-            print(f"mixture_score: {mixture_score}, mixture_learnware: {mixture_id}")
-            if not mixture_learnware_list:
-                mixture_learnware_list = [single_learnware_list[0]]
+            if len(multiple_result) > 0:
+                mixture_id = " ".join([learnware.id for learnware in multiple_result[0].learnwares])
+                print(f"mixture_score: {multiple_result[0].score}, mixture_learnware: {mixture_id}")
+                mixture_learnware_list = multiple_result[0].learnwares
+            else:
+                mixture_learnware_list = [single_result[0].learnware]
 
             # test reuse (job selector)
             reuse_baseline = JobSelectorReuser(learnware_list=mixture_learnware_list, herding_num=100)
diff --git a/examples/workflow_by_code/learnware_example/README.md b/examples/workflow_by_code/learnware_example/README.md
deleted file mode 100644
index 51aac5a..0000000
--- a/examples/workflow_by_code/learnware_example/README.md
+++ /dev/null
@@ -1,10 +0,0 @@
-## How to Generate Environment Yaml
-
-* create env config for conda:
-```shell
-conda env export | grep -v "^prefix: " > environment.yml
-```
-* recover env from config
-```
-conda env create -f environment.yml
-```
\ No newline at end of file
diff --git a/examples/workflow_by_code/learnware_example/environment.yml b/examples/workflow_by_code/learnware_example/environment.yml
deleted file mode 100644
index 2923bdb..0000000
--- a/examples/workflow_by_code/learnware_example/environment.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-name: learnware_example_env
-channels:
-  - defaults
-dependencies:
-  - _libgcc_mutex=0.1=main
-  - _openmp_mutex=5.1=1_gnu
-  - ca-certificates=2023.01.10=h06a4308_0
-  - ld_impl_linux-64=2.38=h1181459_1
-  - libffi=3.4.2=h6a678d5_6
-  - libgcc-ng=11.2.0=h1234567_1
-  - libgomp=11.2.0=h1234567_1
-  - libstdcxx-ng=11.2.0=h1234567_1
-  - ncurses=6.4=h6a678d5_0
-  - openssl=1.1.1t=h7f8727e_0
-  - pip=23.0.1=py38h06a4308_0
-  - python=3.8.16=h7a1cb2a_3
-  - readline=8.2=h5eee18b_0
-  - setuptools=66.0.0=py38h06a4308_0
-  - sqlite=3.41.2=h5eee18b_0
-  - tk=8.6.12=h1ccaba5_0
-  - wheel=0.38.4=py38h06a4308_0
-  - xz=5.2.10=h5eee18b_1
-  - zlib=1.2.13=h5eee18b_0
-  - pip:
-    - joblib==1.2.0
-    - learnware==0.0.1.99
-    - numpy==1.19.5
diff --git a/examples/workflow_by_code/learnware_example/example.yaml b/examples/workflow_by_code/learnware_example/example.yaml
deleted file mode 100644
index 32aa52e..0000000
--- a/examples/workflow_by_code/learnware_example/example.yaml
+++ /dev/null
@@ -1,8 +0,0 @@
-model:
-  class_name: SVM
-  kwargs: {}
-stat_specifications:
-  - module_path: learnware.specification
-    class_name: RKMETableSpecification
-    file_name: svm.json
-    kwargs: {}  
\ No newline at end of file
diff --git a/examples/workflow_by_code/learnware_example/example_init.py b/examples/workflow_by_code/learnware_example/example_init.py
deleted file mode 100644
index 47d3708..0000000
--- a/examples/workflow_by_code/learnware_example/example_init.py
+++ /dev/null
@@ -1,20 +0,0 @@
-import os
-import joblib
-import numpy as np
-from learnware.model import BaseModel
-
-
-class SVM(BaseModel):
-    def __init__(self):
-        super(SVM, self).__init__(input_shape=(64,), output_shape=(10,))
-        dir_path = os.path.dirname(os.path.abspath(__file__))
-        self.model = joblib.load(os.path.join(dir_path, "svm.pkl"))
-
-    def fit(self, X: np.ndarray, y: np.ndarray):
-        pass
-
-    def predict(self, X: np.ndarray) -> np.ndarray:
-        return self.model.predict_proba(X)
-
-    def finetune(self, X: np.ndarray, y: np.ndarray):
-        pass
diff --git a/examples/workflow_by_code/main.py b/examples/workflow_by_code/main.py
deleted file mode 100644
index 8a08a61..0000000
--- a/examples/workflow_by_code/main.py
+++ /dev/null
@@ -1,197 +0,0 @@
-import os
-import fire
-import copy
-import joblib
-import zipfile
-import numpy as np
-from sklearn import svm
-from sklearn.datasets import load_digits
-from sklearn.model_selection import train_test_split
-from shutil import copyfile, rmtree
-
-import learnware
-from learnware.market import instantiate_learnware_market, BaseUserInfo
-from learnware.reuse import JobSelectorReuser, AveragingReuser
-from learnware.specification import generate_rkme_table_spec, RKMETableSpecification
-
-curr_root = os.path.dirname(os.path.abspath(__file__))
-
-user_semantic = {
-    "Data": {"Values": ["Table"], "Type": "Class"},
-    "Task": {
-        "Values": ["Classification"],
-        "Type": "Class",
-    },
-    "Library": {"Values": ["Scikit-learn"], "Type": "Class"},
-    "Scenario": {"Values": ["Education"], "Type": "Tag"},
-    "Description": {"Values": "", "Type": "String"},
-    "Name": {"Values": "", "Type": "String"},
-}
-
-
-class LearnwareMarketWorkflow:
-    def _init_learnware_market(self):
-        """initialize learnware market"""
-        learnware.init()
-        np.random.seed(2023)
-        easy_market = instantiate_learnware_market(market_id="sklearn_digits", name="easy", rebuild=True)
-        return easy_market
-
-    def prepare_learnware_randomly(self, learnware_num=5):
-        self.zip_path_list = []
-        X, y = load_digits(return_X_y=True)
-
-        for i in range(learnware_num):
-            dir_path = os.path.join(curr_root, "learnware_pool", "svm_%d" % (i))
-            os.makedirs(dir_path, exist_ok=True)
-
-            print("Preparing Learnware: %d" % (i))
-
-            data_X, _, data_y, _ = train_test_split(X, y, test_size=0.3, shuffle=True)
-            clf = svm.SVC(kernel="linear", probability=True)
-            clf.fit(data_X, data_y)
-
-            joblib.dump(clf, os.path.join(dir_path, "svm.pkl"))
-
-            spec = generate_rkme_table_spec(X=data_X, gamma=0.1, cuda_idx=0)
-            spec.save(os.path.join(dir_path, "svm.json"))
-
-            init_file = os.path.join(dir_path, "__init__.py")
-            copyfile(
-                os.path.join(curr_root, "learnware_example/example_init.py"), init_file
-            )  # cp example_init.py init_file
-
-            yaml_file = os.path.join(dir_path, "learnware.yaml")
-            copyfile(os.path.join(curr_root, "learnware_example/example.yaml"), yaml_file)  # cp example.yaml yaml_file
-
-            zip_file = dir_path + ".zip"
-            # zip -q -r -j zip_file dir_path
-            with zipfile.ZipFile(zip_file, "w") as zip_obj:
-                for foldername, subfolders, filenames in os.walk(dir_path):
-                    for filename in filenames:
-                        file_path = os.path.join(foldername, filename)
-                        zip_info = zipfile.ZipInfo(filename)
-                        zip_info.compress_type = zipfile.ZIP_STORED
-                        with open(file_path, "rb") as file:
-                            zip_obj.writestr(zip_info, file.read())
-
-            rmtree(dir_path)  # rm -r dir_path
-
-            self.zip_path_list.append(zip_file)
-
-    def test_upload_delete_learnware(self, learnware_num=5, delete=False):
-        easy_market = self._init_learnware_market()
-        self.prepare_learnware_randomly(learnware_num)
-
-        print("Total Item:", len(easy_market))
-
-        for idx, zip_path in enumerate(self.zip_path_list):
-            semantic_spec = copy.deepcopy(user_semantic)
-            semantic_spec["Name"]["Values"] = "learnware_%d" % (idx)
-            semantic_spec["Description"]["Values"] = "test_learnware_number_%d" % (idx)
-            easy_market.add_learnware(zip_path, semantic_spec)
-
-        print("Total Item:", len(easy_market))
-        curr_inds = easy_market.get_learnware_ids()
-        print("Available ids After Uploading Learnwares:", curr_inds)
-
-        if delete:
-            for learnware_id in curr_inds:
-                easy_market.delete_learnware(learnware_id)
-            curr_inds = easy_market.get_learnware_ids()
-            print("Available ids After Deleting Learnwares:", curr_inds)
-
-        return easy_market
-
-    def test_search_semantics(self, learnware_num=5):
-        easy_market = self.test_upload_delete_learnware(learnware_num, delete=False)
-        print("Total Item:", len(easy_market))
-
-        test_folder = os.path.join(curr_root, "test_semantics")
-
-        # unzip -o -q zip_path -d unzip_dir
-        if os.path.exists(test_folder):
-            rmtree(test_folder)
-        os.makedirs(test_folder, exist_ok=True)
-
-        with zipfile.ZipFile(self.zip_path_list[0], "r") as zip_obj:
-            zip_obj.extractall(path=test_folder)
-
-        semantic_spec = copy.deepcopy(user_semantic)
-        semantic_spec["Name"]["Values"] = f"learnware_{learnware_num - 1}"
-        semantic_spec["Description"]["Values"] = f"test_learnware_number_{learnware_num - 1}"
-
-        user_info = BaseUserInfo(semantic_spec=semantic_spec)
-        _, single_learnware_list, _, _ = easy_market.search_learnware(user_info)
-
-        print("User info:", user_info.get_semantic_spec())
-        print(f"Search result:")
-        for learnware in single_learnware_list:
-            print("Choose learnware:", learnware.id, learnware.get_specification().get_semantic_spec())
-
-        rmtree(test_folder)  # rm -r test_folder
-
-    def test_stat_search(self, learnware_num=5):
-        easy_market = self.test_upload_delete_learnware(learnware_num, delete=False)
-        print("Total Item:", len(easy_market))
-
-        test_folder = os.path.join(curr_root, "test_stat")
-
-        for idx, zip_path in enumerate(self.zip_path_list):
-            unzip_dir = os.path.join(test_folder, f"{idx}")
-
-            # unzip -o -q zip_path -d unzip_dir
-            if os.path.exists(unzip_dir):
-                rmtree(unzip_dir)
-            os.makedirs(unzip_dir, exist_ok=True)
-            with zipfile.ZipFile(zip_path, "r") as zip_obj:
-                zip_obj.extractall(path=unzip_dir)
-
-            user_spec = RKMETableSpecification()
-            user_spec.load(os.path.join(unzip_dir, "svm.json"))
-            user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = easy_market.search_learnware(user_info)
-
-            print(f"search result of user{idx}:")
-            for score, learnware in zip(sorted_score_list, single_learnware_list):
-                print(f"score: {score}, learnware_id: {learnware.id}")
-            print(f"mixture_score: {mixture_score}\n")
-            mixture_id = " ".join([learnware.id for learnware in mixture_learnware_list])
-            print(f"mixture_learnware: {mixture_id}\n")
-
-        rmtree(test_folder)  # rm -r test_folder
-
-    def test_learnware_reuse(self, learnware_num=5):
-        easy_market = self.test_upload_delete_learnware(learnware_num, delete=False)
-        print("Total Item:", len(easy_market))
-
-        X, y = load_digits(return_X_y=True)
-        _, data_X, _, data_y = train_test_split(X, y, test_size=0.3, shuffle=True)
-
-        stat_spec = generate_rkme_table_spec(X=data_X, gamma=0.1, cuda_idx=0)
-        user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": stat_spec})
-
-        _, _, _, mixture_learnware_list = easy_market.search_learnware(user_info)
-
-        # print("Mixture Learnware:", mixture_learnware_list)
-
-        # Based on user information, the learnware market returns a list of learnwares (learnware_list)
-        # Use jobselector reuser to reuse the searched learnwares to make prediction
-        reuse_job_selector = JobSelectorReuser(learnware_list=mixture_learnware_list)
-        job_selector_predict_y = reuse_job_selector.predict(user_data=data_X)
-
-        # Use averaging ensemble reuser to reuse the searched learnwares to make prediction
-        reuse_ensemble = AveragingReuser(learnware_list=mixture_learnware_list)
-        ensemble_predict_y = reuse_ensemble.predict(user_data=data_X)
-
-        print("Job Selector Acc:", np.sum(np.argmax(job_selector_predict_y, axis=1) == data_y) / len(data_y))
-        print("Averaging Selector Acc:", np.sum(np.argmax(ensemble_predict_y, axis=1) == data_y) / len(data_y))
-
-
-if __name__ == "__main__":
-    fire.Fire(LearnwareMarketWorkflow)
diff --git a/learnware/client/learnware_client.py b/learnware/client/learnware_client.py
index b396add..f3cbe61 100644
--- a/learnware/client/learnware_client.py
+++ b/learnware/client/learnware_client.py
@@ -18,6 +18,7 @@ from ..market import BaseChecker, EasySemanticChecker, EasyStatChecker
 from ..logger import get_module_logger
 from ..specification import Specification
 from ..learnware import get_learnware_from_dirpath
+from ..market import BaseUserInfo
 from ..tests import get_semantic_specification
 
 CHUNK_SIZE = 1024 * 1024
@@ -204,10 +205,10 @@ class LearnwareClient:
         return learnware_list
 
     @require_login
-    def search_learnware(self, specification: Specification, page_size=10, page_index=0):
+    def search_learnware(self, user_info: BaseUserInfo, page_size=10, page_index=0):
         url = f"{self.host}/engine/search_learnware"
 
-        stat_spec = specification.get_stat_spec()
+        stat_spec = user_info.stat_info
         if len(stat_spec) > 1:
             raise Exception("statistical specification must have only one key.")
 
@@ -222,10 +223,7 @@ class LearnwareClient:
                 stat_spec.save(ftemp.name)
 
             with open(ftemp.name, "r") as fin:
-                semantic_specification = specification.get_semantic_spec()
-                if semantic_specification is None:
-                    semantic_specification = {}
-
+                semantic_specification = user_info.get_semantic_spec()
                 if stat_spec is None:
                     files = None
                 else:
@@ -235,7 +233,7 @@ class LearnwareClient:
                     url,
                     files=files,
                     data={
-                        "semantic_specification": json.dumps(specification.get_semantic_spec()),
+                        "semantic_specification": json.dumps(semantic_specification),
                         "limit": page_size,
                         "page": page_index,
                     },
@@ -249,13 +247,25 @@ class LearnwareClient:
 
                 for learnware in result["data"]["learnware_list_single"]:
                     returns.append(
-                        {
+                        {   
+                            "type": "single",
                             "learnware_id": learnware["learnware_id"],
                             "semantic_specification": learnware["semantic_specification"],
                             "matching": learnware["matching"],
                         }
                     )
-
+                if len(result["data"]["learnware_list_multi"]) > 0:
+                    multiple_learnware = {
+                        "type": "multiple",
+                        "learnware_ids": [],
+                        "semantic_specifications": [],
+                        "matching": result["data"]["learnware_list_multi"][0]["matching"]
+                    }
+                    for learnware in result["data"]["learnware_list_multi"]:
+                        multiple_learnware["learnware_ids"].append(learnware["learnware_id"])
+                        multiple_learnware["semantic_specifications"].append(learnware["semantic_specification"])
+                        
+                    returns.append(multiple_learnware)
         return returns
 
     @require_login
diff --git a/learnware/market/base.py b/learnware/market/base.py
index ddf3d9a..78d06e6 100644
--- a/learnware/market/base.py
+++ b/learnware/market/base.py
@@ -3,11 +3,12 @@ from __future__ import annotations
 import traceback
 import zipfile
 import tempfile
-from typing import Tuple, Any, List, Union
+from typing import Tuple, Any, List, Union, Dict, Optional
+from dataclasses import dataclass
 from ..learnware import Learnware, get_learnware_from_dirpath
 from ..logger import get_module_logger
 
-logger = get_module_logger("market_base", "INFO")
+logger = get_module_logger("market_base")
 
 
 class BaseUserInfo:
@@ -42,6 +43,9 @@ class BaseUserInfo:
     def get_stat_info(self, name: str):
         return self.stat_info.get(name, None)
 
+    def update_semantic_spec(self, semantic_spec: dict):
+        self.semantic_spec = semantic_spec
+        
     def update_stat_info(self, name: str, item: Any):
         """Update stat_info by market
 
@@ -55,6 +59,33 @@ class BaseUserInfo:
         self.stat_info[name] = item
 
 
+@dataclass
+class SingleSearchItem:
+    learnware: Learnware
+    score: Optional[float] = None
+
+@dataclass
+class MultipleSearchItem:
+    learnwares: List[Learnware]
+    score: float
+    
+class SearchResults:
+    def __init__(self, single_results: Optional[List[SingleSearchItem]] = None, multiple_results: Optional[List[MultipleSearchItem]] = None):
+        self.update_single_results([] if single_results is None else single_results)
+        self.update_multiple_results([] if multiple_results is None else multiple_results)
+        
+    def get_single_results(self) -> List[SingleSearchItem]:
+        return self.single_results
+    
+    def get_multiple_results(self) -> List[MultipleSearchItem]:
+        return self.multiple_results
+    
+    def update_single_results(self, single_results: List[SingleSearchItem]):
+        self.single_results = single_results
+    
+    def update_multiple_results(self, multiple_results: List[MultipleSearchItem]):
+        self.multiple_results = multiple_results
+
 class LearnwareMarket:
     """Base interface for market, it provide the interface of search/add/detele/update learnwares"""
 
@@ -150,7 +181,7 @@ class LearnwareMarket:
 
     def search_learnware(
         self, user_info: BaseUserInfo, check_status: int = None, **kwargs
-    ) -> Tuple[Any, List[Learnware]]:
+    ) -> SearchResults:
         """Search learnwares based on user_info from learnwares with check_status
 
         Parameters
@@ -163,7 +194,7 @@ class LearnwareMarket:
 
         Returns
         -------
-        Tuple[Any, List[Learnware]]
+        SearchResults
             Search results
         """
         return self.learnware_searcher(user_info, check_status, **kwargs)
@@ -450,7 +481,7 @@ class BaseSearcher:
     def reset(self, organizer: BaseOrganizer, **kwargs):
         self.learnware_organizer = organizer
 
-    def __call__(self, user_info: BaseUserInfo, check_status: int = None):
+    def __call__(self, user_info: BaseUserInfo, check_status: int = None) -> SearchResults:
         """Search learnwares based on user_info from learnwares with check_status
 
         Parameters
diff --git a/learnware/market/easy/searcher.py b/learnware/market/easy/searcher.py
index 5820ee9..99e1e2d 100644
--- a/learnware/market/easy/searcher.py
+++ b/learnware/market/easy/searcher.py
@@ -2,11 +2,11 @@ import math
 import torch
 import numpy as np
 from rapidfuzz import fuzz
-from typing import Tuple, List, Union
+from typing import Tuple, List, Union, Optional
 
 from .organizer import EasyOrganizer
 from ..utils import parse_specification_type
-from ..base import BaseUserInfo, BaseSearcher
+from ..base import BaseUserInfo, BaseSearcher, SearchResults, SingleSearchItem, MultipleSearchItem
 from ...learnware import Learnware
 from ...specification import RKMETableSpecification, RKMEImageSpecification, RKMETextSpecification, rkme_solve_qp
 from ...logger import get_module_logger
@@ -57,7 +57,7 @@ class EasyExactSemanticSearcher(BaseSearcher):
 
         return True
 
-    def __call__(self, learnware_list: List[Learnware], user_info: BaseUserInfo) -> List[Learnware]:
+    def __call__(self, learnware_list: List[Learnware], user_info: BaseUserInfo) -> SearchResults:
         match_learnwares = []
         for learnware in learnware_list:
             learnware_semantic_spec = learnware.get_specification().get_semantic_spec()
@@ -65,8 +65,7 @@ class EasyExactSemanticSearcher(BaseSearcher):
             if self._match_semantic_spec(user_semantic_spec, learnware_semantic_spec):
                 match_learnwares.append(learnware)
         logger.info("semantic_spec search: choose %d from %d learnwares" % (len(match_learnwares), len(learnware_list)))
-        return match_learnwares
-
+        return SearchResults(single_results=[SingleSearchItem(learnware=_learnware) for _learnware in match_learnwares])
 
 class EasyFuzzSemanticSearcher(BaseSearcher):
     def _match_semantic_spec_tag(self, semantic_spec1, semantic_spec2) -> bool:
@@ -111,7 +110,7 @@ class EasyFuzzSemanticSearcher(BaseSearcher):
 
     def __call__(
         self, learnware_list: List[Learnware], user_info: BaseUserInfo, max_num: int = 50000, min_score: float = 75.0
-    ) -> List[Learnware]:
+    ) -> SearchResults:
         """Search learnware by fuzzy matching of semantic spec
 
         Parameters
@@ -182,7 +181,7 @@ class EasyFuzzSemanticSearcher(BaseSearcher):
                 final_result = matched_learnware_tag
 
         logger.info("semantic_spec search: choose %d from %d learnwares" % (len(final_result), len(learnware_list)))
-        return final_result
+        return SearchResults(single_results=[SingleSearchItem(learnware=_learnware) for _learnware in final_result])
 
 
 class EasyStatSearcher(BaseSearcher):
@@ -328,7 +327,7 @@ class EasyStatSearcher(BaseSearcher):
         user_rkme: RKMETableSpecification,
         max_search_num: int,
         weight_cutoff: float = 0.98,
-    ) -> Tuple[float, List[float], List[Learnware]]:
+    ) -> Tuple[Optional[float], List[float], List[Learnware]]:
         """Select learnwares based on a total mixture ratio, then recalculate their mixture weights
 
         Parameters
@@ -351,7 +350,7 @@ class EasyStatSearcher(BaseSearcher):
         """
         learnware_num = len(learnware_list)
         if learnware_num == 0:
-            return [], []
+            return None, [], []
         if learnware_num < max_search_num:
             logger.warning("Available Learnware num less than search_num!")
             max_search_num = learnware_num
@@ -370,7 +369,7 @@ class EasyStatSearcher(BaseSearcher):
 
         if len(mixture_list) <= 1:
             mixture_list = [learnware_list[sort_by_weight_idx_list[0]]]
-            mixture_weight = [1]
+            mixture_weight = [1.0]
             mmd_dist = user_rkme.dist(mixture_list[0].specification.get_stat_spec_by_name(self.stat_spec_type))
         else:
             if len(mixture_list) > max_search_num:
@@ -455,7 +454,7 @@ class EasyStatSearcher(BaseSearcher):
         user_rkme: RKMETableSpecification,
         max_search_num: int,
         decay_rate: float = 0.95,
-    ) -> Tuple[float, List[float], List[Learnware]]:
+    ) -> Tuple[Optional[float], List[float], List[Learnware]]:
         """Greedily match learnwares such that their mixture become closer and closer to user's rkme
 
         Parameters
@@ -484,7 +483,7 @@ class EasyStatSearcher(BaseSearcher):
             max_search_num = learnware_num
 
         flag_list = [0 for _ in range(learnware_num)]
-        mixture_list, weight_list, mmd_dist = [], None, None
+        mixture_list, weight_list, mmd_dist = [], [], None
         intermediate_K, intermediate_C = np.zeros((1, 1)), np.zeros((1, 1))
 
         for k in range(max_search_num):
@@ -543,10 +542,10 @@ class EasyStatSearcher(BaseSearcher):
             the second is the list of Learnware
             both lists are sorted by mmd dist
         """
-        RKME_list = [learnware.specification.get_stat_spec_by_name(self.stat_spec_type) for learnware in learnware_list]
+        rkme_list = [learnware.specification.get_stat_spec_by_name(self.stat_spec_type) for learnware in learnware_list]
         mmd_dist_list = []
-        for RKME in RKME_list:
-            mmd_dist = RKME.dist(user_rkme)
+        for rkme in rkme_list:
+            mmd_dist = rkme.dist(user_rkme)
             mmd_dist_list.append(mmd_dist)
 
         sorted_idx_list = sorted(range(len(learnware_list)), key=lambda k: mmd_dist_list[k])
@@ -561,7 +560,7 @@ class EasyStatSearcher(BaseSearcher):
         user_info: BaseUserInfo,
         max_search_num: int = 5,
         search_method: str = "greedy",
-    ) -> Tuple[List[float], List[Learnware], float, List[Learnware]]:
+    ) -> SearchResults:
         self.stat_spec_type = parse_specification_type(stat_specs=user_info.stat_info)
         if self.stat_spec_type is None:
             raise KeyError("No supported stat specification is given in the user info")
@@ -572,7 +571,7 @@ class EasyStatSearcher(BaseSearcher):
 
         sorted_dist_list, single_learnware_list = self._search_by_rkme_spec_single(learnware_list, user_rkme)
         if len(single_learnware_list) == 0:
-            return [], [], None, []
+            return SearchResults()
 
         processed_learnware_list = single_learnware_list[: max_search_num * max_search_num]
         if sorted_dist_list[0] > 0 and search_method == "auto":
@@ -622,7 +621,16 @@ class EasyStatSearcher(BaseSearcher):
             mixture_score = min(1, mixture_score * ratio) if mixture_score is not None else None
         logger.info(f"After filter by rkme spec, learnware_list length is {len(learnware_list)}")
 
-        return sorted_score_list, single_learnware_list, mixture_score, mixture_learnware_list
+        search_results = SearchResults()
+        
+        search_results.update_single_results(
+            [SingleSearchItem(learnware=_learnware, score=_score) for _score, _learnware in zip(sorted_score_list, single_learnware_list)]
+        )
+        if mixture_score is not None and len(mixture_learnware_list) > 0:
+            search_results.update_multiple_results(
+                [MultipleSearchItem(learnwares=mixture_learnware_list, score=mixture_score)]           
+            )
+        return search_results
 
 
 class EasySearcher(BaseSearcher):
@@ -638,7 +646,7 @@ class EasySearcher(BaseSearcher):
 
     def __call__(
         self, user_info: BaseUserInfo, check_status: int = None, max_search_num: int = 5, search_method: str = "greedy"
-    ) -> Tuple[List[float], List[Learnware], float, List[Learnware]]:
+    ) -> SearchResults:
         """Search learnwares based on user_info from learnwares with check_status
 
         Parameters
@@ -660,12 +668,13 @@ class EasySearcher(BaseSearcher):
             the fourth is the list of Learnware (mixture), the size is search_num
         """
         learnware_list = self.learnware_organizer.get_learnwares(check_status=check_status)
-        learnware_list = self.semantic_searcher(learnware_list, user_info)
+        semantic_search_result = self.semantic_searcher(learnware_list, user_info)
 
+        learnware_list = [search_item.learnware for search_item in semantic_search_result.get_single_results()]
         if len(learnware_list) == 0:
-            return [], [], 0.0, []
+            return SearchResults()
 
         if parse_specification_type(stat_specs=user_info.stat_info) is not None:
             return self.stat_searcher(learnware_list, user_info, max_search_num, search_method)
         else:
-            return None, learnware_list, 0.0, None
+            return semantic_search_result
diff --git a/learnware/market/heterogeneous/searcher.py b/learnware/market/heterogeneous/searcher.py
index 7a79004..f261703 100644
--- a/learnware/market/heterogeneous/searcher.py
+++ b/learnware/market/heterogeneous/searcher.py
@@ -2,7 +2,7 @@ import traceback
 from typing import Tuple, List
 
 from .utils import is_hetero
-from ..base import BaseUserInfo
+from ..base import BaseUserInfo, SearchResults
 from ..easy import EasySearcher
 from ..utils import parse_specification_type
 from ...learnware import Learnware
@@ -15,7 +15,7 @@ logger = get_module_logger("hetero_searcher")
 class HeteroSearcher(EasySearcher):
     def __call__(
         self, user_info: BaseUserInfo, check_status: int = None, max_search_num: int = 5, search_method: str = "greedy"
-    ) -> Tuple[List[float], List[Learnware], float, List[Learnware]]:
+    ) -> SearchResults:
         """Search learnwares based on user_info from learnwares with check_status.
            Employs heterogeneous learnware search if specific requirements are met, otherwise resorts to homogeneous search methods.
 
@@ -38,10 +38,11 @@ class HeteroSearcher(EasySearcher):
             the fourth is the list of Learnware (mixture), the size is search_num
         """
         learnware_list = self.learnware_organizer.get_learnwares(check_status=check_status)
-        learnware_list = self.semantic_searcher(learnware_list, user_info)
+        semantic_search_result = self.semantic_searcher(learnware_list, user_info)
 
+        learnware_list = [search_item.learnware for search_item in semantic_search_result.get_single_results()]
         if len(learnware_list) == 0:
-            return [], [], 0.0, []
+            return SearchResults()
 
         if parse_specification_type(stat_specs=user_info.stat_info) is not None:
             if is_hetero(stat_specs=user_info.stat_info, semantic_spec=user_info.semantic_spec):
@@ -49,4 +50,4 @@ class HeteroSearcher(EasySearcher):
                 user_info.update_stat_info(user_hetero_spec.type, user_hetero_spec)
             return self.stat_searcher(learnware_list, user_info, max_search_num, search_method)
         else:
-            return None, learnware_list, 0.0, None
+            return semantic_search_result
diff --git a/tests/test_hetero_market/test_hetero.py b/tests/test_hetero_market/test_hetero.py
index 686fc52..be828e5 100644
--- a/tests/test_hetero_market/test_hetero.py
+++ b/tests/test_hetero_market/test_hetero.py
@@ -199,26 +199,28 @@ class TestMarket(unittest.TestCase):
         semantic_spec["Name"]["Values"] = f"learnware_{learnware_num - 1}"
 
         user_info = BaseUserInfo(semantic_spec=semantic_spec)
-        _, single_learnware_list, _, _ = hetero_market.search_learnware(user_info)
+        search_result = hetero_market.search_learnware(user_info)
+        single_result = search_result.get_single_results()
 
         print("User info:", user_info.get_semantic_spec())
         print(f"Search result:")
-        assert len(single_learnware_list) == 1, f"Exact semantic search failed!"
-        for learnware in single_learnware_list:
-            semantic_spec1 = learnware.get_specification().get_semantic_spec()
-            print("Choose learnware:", learnware.id, semantic_spec1)
+        assert len(single_result) == 1, f"Exact semantic search failed!"
+        for search_item in single_result:
+            semantic_spec1 = search_item.learnware.get_specification().get_semantic_spec()
+            print("Choose learnware:", search_item.learnware.id, semantic_spec1)
             assert semantic_spec1["Name"]["Values"] == semantic_spec["Name"]["Values"], f"Exact semantic search failed!"
 
         semantic_spec["Name"]["Values"] = "laernwaer"
         user_info = BaseUserInfo(semantic_spec=semantic_spec)
-        _, single_learnware_list, _, _ = hetero_market.search_learnware(user_info)
+        search_result = hetero_market.search_learnware(user_info)
+        single_result = search_result.get_single_results()
 
         print("User info:", user_info.get_semantic_spec())
         print(f"Search result:")
-        assert len(single_learnware_list) == self.learnware_num, f"Fuzzy semantic search failed!"
-        for learnware in single_learnware_list:
-            semantic_spec1 = learnware.get_specification().get_semantic_spec()
-            print("Choose learnware:", learnware.id, semantic_spec1)
+        assert len(single_result) == self.learnware_num, f"Fuzzy semantic search failed!"
+        for search_item in single_result:
+            semantic_spec1 = search_item.learnware.get_specification().get_semantic_spec()
+            print("Choose learnware:", search_item.learnware.id, semantic_spec1)
 
     def test_stat_search(self, learnware_num=5):
         hetero_market = self.test_train_market_model(learnware_num)
@@ -256,49 +258,40 @@ class TestMarket(unittest.TestCase):
             semantic_spec["Input"]["Description"] = {
                 str(key): semantic_spec["Input"]["Description"][str(key)] for key in range(user_dim)
             }
-
             user_info = BaseUserInfo(semantic_spec=semantic_spec, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = hetero_market.search_learnware(user_info)
-
+            
+            search_result = hetero_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
+            multiple_result = search_result.get_multiple_results()
+            
             print(f"search result of user{idx}:")
-            for score, learnware in zip(sorted_score_list, single_learnware_list):
-                print(f"score: {score}, learnware_id: {learnware.id}")
-            print(
-                f"mixture_score: {mixture_score}, mixture_learnware_ids: {[item.id for item in mixture_learnware_list]}"
-            )
+            for single_item in single_result:
+                print(f"score: {single_item.score}, learnware_id: {single_item.learnware.id}")
+                
+            for multiple_item in multiple_result:
+                print(
+                    f"mixture_score: {multiple_item.score}, mixture_learnware_ids: {[item.id for item in multiple_item.learnwares]}"
+                )
 
             # inproper key "Task" in semantic_spec, use homo search and print invalid semantic_spec
             print(">> test for key 'Task' has empty 'Values':")
             semantic_spec["Task"] = {"Values": ["Segmentation"], "Type": "Class"}
 
             user_info = BaseUserInfo(semantic_spec=semantic_spec, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = hetero_market.search_learnware(user_info)
+            search_result = hetero_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
 
-            assert len(single_learnware_list) == 0, f"Statistical search failed!"
+            assert len(single_result) == 0, f"Statistical search failed!"
 
             # delete key "Task" in semantic_spec, use homo search and print WARNING INFO with "User doesn't provide correct task type"
             print(">> delele key 'Task' test:")
             semantic_spec.pop("Task")
 
             user_info = BaseUserInfo(semantic_spec=semantic_spec, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = hetero_market.search_learnware(user_info)
+            search_result = hetero_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
 
-            assert len(single_learnware_list) == 0, f"Statistical search failed!"
+            assert len(single_result) == 0, f"Statistical search failed!"
 
             # modify semantic info with mismatch dim, use homo search and print "User data feature dimensions mismatch with semantic specification."
             print(">> mismatch dim test")
@@ -310,14 +303,10 @@ class TestMarket(unittest.TestCase):
             }
 
             user_info = BaseUserInfo(semantic_spec=semantic_spec, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = hetero_market.search_learnware(user_info)
+            search_result = hetero_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
 
-            assert len(single_learnware_list) == 0, f"Statistical search failed!"
+            assert len(single_result) == 0, f"Statistical search failed!"
 
         rmtree(test_folder)  # rm -r test_folder
 
@@ -338,21 +327,19 @@ class TestMarket(unittest.TestCase):
             user_spec = RKMETableSpecification()
             user_spec.load(os.path.join(unzip_dir, "stat.json"))
             user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = hetero_market.search_learnware(user_info)
-
-            target_spec_num = 3 if idx % 2 == 0 else 2
-            assert len(single_learnware_list) >= 1, f"Statistical search failed!"
+            search_result = hetero_market.search_learnware(user_info)
+            single_result = search_result.get_single_results()
+            multiple_result = search_result.get_multiple_results()
+
+            assert len(single_result) >= 1, f"Statistical search failed!"
             print(f"search result of user{idx}:")
-            for score, learnware in zip(sorted_score_list, single_learnware_list):
-                print(f"score: {score}, learnware_id: {learnware.id}")
-            print(f"mixture_score: {mixture_score}\n")
-            mixture_id = " ".join([learnware.id for learnware in mixture_learnware_list])
-            print(f"mixture_learnware: {mixture_id}\n")
+            for single_item in single_result:
+                print(f"score: {single_item.score}, learnware_id: {single_item.learnware.id}")
+            
+            for multiple_item in multiple_result:
+                print(f"mixture_score: {multiple_item.score}\n")
+                mixture_id = " ".join([learnware.id for learnware in multiple_item.learnwares])
+                print(f"mixture_learnware: {mixture_id}\n")
 
         rmtree(test_folder)  # rm -r test_folder
 
@@ -370,26 +357,24 @@ class TestMarket(unittest.TestCase):
 
         # learnware market search
         hetero_market = self.test_train_market_model(learnware_num)
-        (
-            sorted_score_list,
-            single_learnware_list,
-            mixture_score,
-            mixture_learnware_list,
-        ) = hetero_market.search_learnware(user_info)
-
+        search_result = hetero_market.search_learnware(user_info)
+        single_result = search_result.get_single_results()
+        multiple_result = search_result.get_multiple_results()
         # print search results
-        for score, learnware in zip(sorted_score_list, single_learnware_list):
-            print(f"score: {score}, learnware_id: {learnware.id}")
-        print(f"mixture_score: {mixture_score}, mixture_learnware_ids: {[item.id for item in mixture_learnware_list]}")
+        for single_item in single_result:
+            print(f"score: {single_item.score}, learnware_id: {single_item.learnware.id}")
+        
+        for multiple_item in multiple_result:
+            print(f"mixture_score: {multiple_item.score}, mixture_learnware_ids: {[item.id for item in multiple_item.learnwares]}")
 
         # single model reuse
-        hetero_learnware = HeteroMapAlignLearnware(single_learnware_list[0], mode="regression")
+        hetero_learnware = HeteroMapAlignLearnware(single_result[0].learnware, mode="regression")
         hetero_learnware.align(user_spec, X[:100], y[:100])
         single_predict_y = hetero_learnware.predict(X)
 
         # multi model reuse
         hetero_learnware_list = []
-        for learnware in mixture_learnware_list:
+        for learnware in multiple_result[0].learnwares:
             hetero_learnware = HeteroMapAlignLearnware(learnware, mode="regression")
             hetero_learnware.align(user_spec, X[:100], y[:100])
             hetero_learnware_list.append(hetero_learnware)
diff --git a/tests/test_learnware_client/test_all_learnware.py b/tests/test_learnware_client/test_all_learnware.py
index 2303089..276ac00 100644
--- a/tests/test_learnware_client/test_all_learnware.py
+++ b/tests/test_learnware_client/test_all_learnware.py
@@ -6,6 +6,7 @@ import tempfile
 
 from learnware.client import LearnwareClient
 from learnware.specification import Specification
+from learnware.market import BaseUserInfo
 
 
 class TestAllLearnware(unittest.TestCase):
@@ -30,16 +31,9 @@ class TestAllLearnware(unittest.TestCase):
 
     def test_all_learnware(self):
         max_learnware_num = 1000
-        semantic_spec = dict()
-        semantic_spec["Data"] = {"Type": "Class", "Values": []}
-        semantic_spec["Task"] = {"Type": "Class", "Values": []}
-        semantic_spec["Library"] = {"Type": "Class", "Values": []}
-        semantic_spec["Scenario"] = {"Type": "Tag", "Values": []}
-        semantic_spec["Name"] = {"Type": "String", "Values": ""}
-        semantic_spec["Description"] = {"Type": "String", "Values": ""}
-
-        specification = Specification(semantic_spec=semantic_spec)
-        result = self.client.search_learnware(specification, page_size=max_learnware_num)
+        semantic_spec = self.client.create_semantic_specification()
+        user_info = BaseUserInfo(semantic_spec=semantic_spec, stat_info={})
+        result = self.client.search_learnware(user_info, page_size=max_learnware_num)
         print(f"result size: {len(result)}")
         print(f"key in result: {[key for key in result[0]]}")
 
diff --git a/tests/test_workflow/test_workflow.py b/tests/test_workflow/test_workflow.py
index 38ed69f..0702a13 100644
--- a/tests/test_workflow/test_workflow.py
+++ b/tests/test_workflow/test_workflow.py
@@ -143,12 +143,13 @@ class TestWorkflow(unittest.TestCase):
         semantic_spec["Description"]["Values"] = f"test_learnware_number_{learnware_num - 1}"
 
         user_info = BaseUserInfo(semantic_spec=semantic_spec)
-        _, single_learnware_list, _, _ = easy_market.search_learnware(user_info)
-
+        search_result = easy_market.search_learnware(user_info)
+        single_result = search_result.get_single_results()
+        
         print("User info:", user_info.get_semantic_spec())
         print(f"Search result:")
-        for learnware in single_learnware_list:
-            print("Choose learnware:", learnware.id, learnware.get_specification().get_semantic_spec())
+        for search_item in single_result:
+            print("Choose learnware:", search_item.learnware.id, search_item.learnware.get_specification().get_semantic_spec())
 
         rmtree(test_folder)  # rm -r test_folder
 
@@ -171,20 +172,20 @@ class TestWorkflow(unittest.TestCase):
             user_spec = RKMETableSpecification()
             user_spec.load(os.path.join(unzip_dir, "svm.json"))
             user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": user_spec})
-            (
-                sorted_score_list,
-                single_learnware_list,
-                mixture_score,
-                mixture_learnware_list,
-            ) = easy_market.search_learnware(user_info)
-
-            assert len(single_learnware_list) >= 1, f"Statistical search failed!"
+            search_results = easy_market.search_learnware(user_info)
+
+            single_result = search_results.get_single_results()
+            multiple_result = search_results.get_multiple_results()
+            
+            assert len(single_result) >= 1, f"Statistical search failed!"
             print(f"search result of user{idx}:")
-            for score, learnware in zip(sorted_score_list, single_learnware_list):
-                print(f"score: {score}, learnware_id: {learnware.id}")
-            print(f"mixture_score: {mixture_score}\n")
-            mixture_id = " ".join([learnware.id for learnware in mixture_learnware_list])
-            print(f"mixture_learnware: {mixture_id}\n")
+            for search_item in single_result:
+                print(f"score: {search_item.score}, learnware_id: {search_item.learnware.id}")
+            
+            for mixture_item in multiple_result:
+                print(f"mixture_score: {mixture_item.score}\n")
+                mixture_id = " ".join([learnware.id for learnware in mixture_item.learnwares])
+                print(f"mixture_learnware: {mixture_id}\n")
 
         rmtree(test_folder)  # rm -r test_folder
 
@@ -198,24 +199,25 @@ class TestWorkflow(unittest.TestCase):
         stat_spec = generate_rkme_table_spec(X=data_X, gamma=0.1, cuda_idx=0)
         user_info = BaseUserInfo(semantic_spec=user_semantic, stat_info={"RKMETableSpecification": stat_spec})
 
-        _, _, _, mixture_learnware_list = easy_market.search_learnware(user_info)
-
+        search_results = easy_market.search_learnware(user_info)
+        multiple_result = search_results.get_multiple_results()
+        mixture_item = multiple_result[0]
         # Based on user information, the learnware market returns a list of learnwares (learnware_list)
         # Use jobselector reuser to reuse the searched learnwares to make prediction
-        reuse_job_selector = JobSelectorReuser(learnware_list=mixture_learnware_list)
+        reuse_job_selector = JobSelectorReuser(learnware_list=mixture_item.learnwares)
         job_selector_predict_y = reuse_job_selector.predict(user_data=data_X)
 
         # Use averaging ensemble reuser to reuse the searched learnwares to make prediction
-        reuse_ensemble = AveragingReuser(learnware_list=mixture_learnware_list, mode="vote_by_prob")
+        reuse_ensemble = AveragingReuser(learnware_list=mixture_item.learnwares, mode="vote_by_prob")
         ensemble_predict_y = reuse_ensemble.predict(user_data=data_X)
 
         # Use ensemble pruning reuser to reuse the searched learnwares to make prediction
-        reuse_ensemble = EnsemblePruningReuser(learnware_list=mixture_learnware_list, mode="classification")
+        reuse_ensemble = EnsemblePruningReuser(learnware_list=mixture_item.learnwares, mode="classification")
         reuse_ensemble.fit(train_X[-200:], train_y[-200:])
         ensemble_pruning_predict_y = reuse_ensemble.predict(user_data=data_X)
 
         # Use feature augment reuser to reuse the searched learnwares to make prediction
-        reuse_feature_augment = FeatureAugmentReuser(learnware_list=mixture_learnware_list, mode="classification")
+        reuse_feature_augment = FeatureAugmentReuser(learnware_list=mixture_item.learnwares, mode="classification")
         reuse_feature_augment.fit(train_X[-200:], train_y[-200:])
         feature_augment_predict_y = reuse_feature_augment.predict(user_data=data_X)
 
@@ -227,8 +229,8 @@ class TestWorkflow(unittest.TestCase):
 
 def suite():
     _suite = unittest.TestSuite()
-    _suite.addTest(TestWorkflow("test_prepare_learnware_randomly"))
-    _suite.addTest(TestWorkflow("test_upload_delete_learnware"))
+    #_suite.addTest(TestWorkflow("test_prepare_learnware_randomly"))
+    #_suite.addTest(TestWorkflow("test_upload_delete_learnware"))
     _suite.addTest(TestWorkflow("test_search_semantics"))
     _suite.addTest(TestWorkflow("test_stat_search"))
     _suite.addTest(TestWorkflow("test_learnware_reuse"))