diff --git a/learnware/market/base.py b/learnware/market/base.py
index 01957e3..e4ca3c4 100644
--- a/learnware/market/base.py
+++ b/learnware/market/base.py
@@ -58,7 +58,28 @@ class BaseMarket:
         """Initializing an empty market"""
         self.learnware_list = {}  # id: Learnware
         self.count = 0
-        self.property_list = None
+        self.property_list = {
+            'Data': {
+                'Values': ['Tabular', 'Image', 'Video', 'Text', 'Audio'],
+                'Type' : 'Class', # Choose only one class
+            },
+            'Task': {
+                'Values': ['Classification','Regression','Clustering','Feature Extraction','Generation','Segmentation','Object Detection'],
+                'Type': 'Class', # Choose only one class
+            },
+            'Device': {
+                'Values': ['CPU', 'GPU'],
+                'Type': 'Tag', # Choose one or more tags
+            },
+            'Scenario': {
+                'Values': ['Business', 'Financial', 'Health', 'Politics', 'Computer', 'Internet', 'Traffic', 'Nature', 'Fashion', 'Industry', 'Agriculture', 'Education', 'Entertainment', 'Architecture'],
+                'Type': 'Tag', # Choose one or more tags
+            },
+            'Description': {
+                'Values': str,
+                'Type': 'Description',
+            },
+        }
 
     def reload_market(self, market_path: str, property_list_path: str, load_mode: str = "database") -> bool:
         """Reload the market when server restared.
@@ -165,6 +186,29 @@ class BaseMarket:
             - first is recommended combination, None when no recommended combination is calculated or statistical specification is not provided.
             - second is a list of matched learnwares
         """
+        def search_by_property():
+            def match_property(property1, property2):
+                if property1.keys() != property2.keys():
+                    raise Exception("property key error".format(property1.keys(), property2.keys()))
+                for key in property1.keys():
+                    if property1[key]['Type'] == 'Class':
+                        if property1[key]['Values'] != property2[key]['Values']:
+                            return False
+                    elif property1[key]['Type'] == 'Tag':
+                        if not (set(property1[key]['Values']) & set(property2[key]['Values'])):
+                            return False
+                return True
+            
+            match_learnwares = []
+            for learnware in self.learnware_list:
+                learnware_property = learnware.get_specification().get_property()
+                user_property = user_info.get_property()
+                if match_property(learnware_property, user_property):
+                    match_learnwares.append(learnware)
+            return match_learnwares
+        
+        match_learnwares = search_by_property()
+
         pass
 
     def get_learnware_by_ids(self, id: Union[str, List[str]]) -> Union[Learnware, List[Learnware]]:
diff --git a/learnware/specification/base.py b/learnware/specification/base.py
index c9f9e60..8982b31 100644
--- a/learnware/specification/base.py
+++ b/learnware/specification/base.py
@@ -16,8 +16,8 @@ class BaseStatSpecification:
 
 
 class Specification:
-    def __init__(self):
-        self.property = None
+    def __init__(self, property=None):
+        self.property = property
         self.stat_spec = {}  # stat_spec should be dict
 
     def get_stat_spec(self):