diff --git a/server/knowledge_base/kb_service/base.py b/server/knowledge_base/kb_service/base.py
index ce14d3c..c97f8cc 100644
--- a/server/knowledge_base/kb_service/base.py
+++ b/server/knowledge_base/kb_service/base.py
@@ -50,10 +50,9 @@ class KBService(ABC):
     def _load_embeddings(self, embed_device: str = embedding_device()) -> Embeddings:
         return load_embeddings(self.embed_model, embed_device)
 
-    def save_vector_store(self, vector_store=None):
+    def save_vector_store(self):
         '''
-        保存向量库，仅支持FAISS。对于其它向量库该函数不做任何操作。
-        减少FAISS向量库操作时的类型判断。
+        保存向量库:FAISS保存到磁盘，milvus保存到数据库。PGVector暂未支持
         '''
         pass
 
diff --git a/server/knowledge_base/kb_service/milvus_kb_service.py b/server/knowledge_base/kb_service/milvus_kb_service.py
index 444765f..f45a8d9 100644
--- a/server/knowledge_base/kb_service/milvus_kb_service.py
+++ b/server/knowledge_base/kb_service/milvus_kb_service.py
@@ -22,6 +22,10 @@ class MilvusKBService(KBService):
         from pymilvus import Collection
         return Collection(milvus_name)
 
+    def save_vector_store(self):
+        if self.milvus.col:
+            self.milvus.col.flush()
+
     def get_doc_by_id(self, id: str) -> Optional[Document]:
         if self.milvus.col:
             data_list = self.milvus.col.query(expr=f'pk == {id}', output_fields=["*"])
@@ -56,6 +60,7 @@ class MilvusKBService(KBService):
 
     def do_drop_kb(self):
         if self.milvus.col:
+            self.milvus.col.release()
             self.milvus.col.drop()
 
     def do_search(self, query: str, top_k: int, score_threshold: float, embeddings: Embeddings):
@@ -63,6 +68,11 @@ class MilvusKBService(KBService):
         return score_threshold_process(score_threshold, top_k, self.milvus.similarity_search_with_score(query, top_k))
 
     def do_add_doc(self, docs: List[Document], **kwargs) -> List[Dict]:
+        # TODO: workaround for bug #10492 in langchain==0.0.286
+        for doc in docs:
+            for field in self.milvus.fields:
+                doc.metadata.setdefault(field, "")
+
         ids = self.milvus.add_documents(docs)
         doc_infos = [{"id": id, "metadata": doc.metadata} for id, doc in zip(ids, docs)]
         return doc_infos
@@ -76,7 +86,8 @@ class MilvusKBService(KBService):
 
     def do_clear_vs(self):
         if self.milvus.col:
-            self.milvus.col.drop()
+            self.do_drop_kb()
+            self.do_init()
 
 
 if __name__ == '__main__':
diff --git a/server/knowledge_base/kb_service/pg_kb_service.py b/server/knowledge_base/kb_service/pg_kb_service.py
index e6381fa..fa832ab 100644
--- a/server/knowledge_base/kb_service/pg_kb_service.py
+++ b/server/knowledge_base/kb_service/pg_kb_service.py
@@ -26,6 +26,7 @@ class PGKBService(KBService):
                                   collection_name=self.kb_name,
                                   distance_strategy=DistanceStrategy.EUCLIDEAN,
                                   connection_string=kbs_config.get("pg").get("connection_uri"))
+
     def get_doc_by_id(self, id: str) -> Optional[Document]:
         with self.pg_vector.connect() as connect:
             stmt = text("SELECT document, cmetadata FROM langchain_pg_embedding WHERE collection_id=:id")
@@ -77,6 +78,7 @@ class PGKBService(KBService):
 
     def do_clear_vs(self):
         self.pg_vector.delete_collection()
+        self.pg_vector.create_collection()
 
 
 if __name__ == '__main__':
diff --git a/server/knowledge_base/migrate.py b/server/knowledge_base/migrate.py
index 118ae37..893c37d 100644
--- a/server/knowledge_base/migrate.py
+++ b/server/knowledge_base/migrate.py
@@ -68,9 +68,7 @@ def folder2db(
                 kb.add_doc(kb_file=kb_file, docs=docs, not_refresh_vs_cache=True)
             else:
                 print(result)
-
-        if kb.vs_type() == SupportedVSType.FAISS:
-            kb.save_vector_store()
+        kb.save_vector_store()
     elif mode == "fill_info_only":
         files = list_files_from_folder(kb_name)
         kb_files = file_to_kbfile(kb_name, files)
@@ -84,9 +82,7 @@ def folder2db(
 
         for kb_file in kb_files:
             kb.update_doc(kb_file, not_refresh_vs_cache=True)
-
-        if kb.vs_type() == SupportedVSType.FAISS:
-            kb.save_vector_store()
+        kb.save_vector_store()
     elif mode == "increament":
         db_files = kb.list_files()
         folder_files = list_files_from_folder(kb_name)
@@ -101,9 +97,7 @@ def folder2db(
                 kb.add_doc(kb_file=kb_file, docs=docs, not_refresh_vs_cache=True)
             else:
                 print(result)
-
-        if kb.vs_type() == SupportedVSType.FAISS:
-            kb.save_vector_store()
+        kb.save_vector_store()
     else:
         print(f"unspported migrate mode: {mode}")
 
@@ -133,8 +127,7 @@ def prune_db_files(kb_name: str):
         kb_files = file_to_kbfile(kb_name, files)
         for kb_file in kb_files:
             kb.delete_doc(kb_file, not_refresh_vs_cache=True)
-        if kb.vs_type() == SupportedVSType.FAISS:
-            kb.save_vector_store()
+        kb.save_vector_store()
         return kb_files
 
 def prune_folder_files(kb_name: str):