diff --git a/learnware/market/database_ops.py b/learnware/market/database_ops.py
index 0dc5b7f..e0c52ee 100644
--- a/learnware/market/database_ops.py
+++ b/learnware/market/database_ops.py
@@ -18,13 +18,14 @@ def init_empty_db(func):
             """SELECT name FROM sqlite_master WHERE type='table' AND name='LEARNWARE'; """
         ).fetchall()
         if len(listOfTables) == 0:
-            logger.info("Initializing Database in %s..." % (os.path.join(C.database_path, "market.db")))
+            logger.info("Initializing Database in %s..." % (os.path.join(C.database_path, f"market_{market_id}.db")))
             cur.execute(
                 """CREATE TABLE LEARNWARE
             (ID CHAR(10) PRIMARY KEY     NOT NULL,
             SEMANTIC_SPEC            TEXT     NOT NULL,
             ZIP_PATH     TEXT NOT NULL,
-            FOLDER_PATH         TEXT NOT NULL);"""
+            FOLDER_PATH         TEXT NOT NULL,
+            USE_FLAG         TEXT NOT NULL);"""
             )
             logger.info("Database Built!")
         kwargs["cur"] = cur
@@ -49,12 +50,12 @@ def clear_learnware_table(cur):
 
 
 @init_empty_db
-def add_learnware_to_db(id: str, semantic_spec: dict, zip_path: str, folder_path: str, cur):
+def add_learnware_to_db(id: str, semantic_spec: dict, zip_path: str, folder_path: str, use_flag: str, cur):
     semantic_spec_str = json.dumps(semantic_spec)
     cur.execute(
-        "INSERT INTO LEARNWARE (ID,SEMANTIC_SPEC,ZIP_PATH,FOLDER_PATH) \
-      VALUES ('%s', '%s', '%s', '%s' )"
-        % (id, semantic_spec_str, zip_path, folder_path)
+        "INSERT INTO LEARNWARE (ID,SEMANTIC_SPEC,ZIP_PATH,FOLDER_PATH,USE_FLAG) \
+      VALUES ('%s', '%s', '%s', '%s', '%s')"
+        % (id, semantic_spec_str, zip_path, folder_path, use_flag)
     )
 
 
diff --git a/learnware/market/easy.py b/learnware/market/easy.py
index b5b772c..f8fd307 100644
--- a/learnware/market/easy.py
+++ b/learnware/market/easy.py
@@ -19,9 +19,9 @@ logger = get_module_logger("market", "INFO")
 
 
 class EasyMarket(BaseMarket):
-    INVALID_LEARNWARE = -1
-    NOPREDICTION_LEARNWARE = 0
-    PREDICTION_LEARWARE = 1
+    INVALID_LEARNWARE = "INVALID"
+    NONUSABLE_LEARNWARE = "NONUSABLE"
+    USABLE_LEARWARE = "USABLE"
 
     def __init__(self, market_id: str = "default", rebuild: bool = False):
         """Initialize Learnware Market.
@@ -79,8 +79,7 @@ class EasyMarket(BaseMarket):
             learnware.instantiate_model()
         except Exception as e:
             logger.warning(f"The learnware [{learnware.id}] is instantiated failed! Due to {repr(e)}")
-            raise
-            return cls.INVALID_LEARNWARE
+            return cls.NONUSABLE_LEARNWARE
 
         try:
             spec_data = learnware.specification.stat_spec["RKMEStatSpecification"].get_z()
@@ -92,9 +91,9 @@ class EasyMarket(BaseMarket):
             pred_spec = learnware.predict(spec_data)
         except Exception:
             logger.warning(f"The learnware [{learnware.id}] prediction is not avaliable")
-            return cls.NOPREDICTION_LEARNWARE
+            return cls.NONUSABLE_LEARNWARE
 
-        return cls.PREDICTION_LEARWARE
+        return cls.USABLE_LEARWARE
 
     def add_learnware(self, zip_path: str, semantic_spec: dict) -> Tuple[str, bool]:
         """Add a learnware into the market.
@@ -188,6 +187,7 @@ class EasyMarket(BaseMarket):
                     semantic_spec=semantic_spec,
                     zip_path=target_zip_dir,
                     folder_path=target_folder_dir,
+                    use_flag=check_flag,
                 )
                 return id, True
             else: