diff --git a/server/chat/chat.py b/server/chat/chat.py
index 27d880e..a0c60b5 100644
--- a/server/chat/chat.py
+++ b/server/chat/chat.py
@@ -13,15 +13,15 @@ from server.chat.utils import History
 
 
 def chat(query: str = Body(..., description="用户输入", example="恼羞成怒"),
-         history: Optional[List[History]] = Body(...,
-                                                 description="历史对话",
-                                                 example=[
-                                                     {"role": "user", "content": "我们来玩成语接龙，我先来，生龙活虎"},
-                                                     {"role": "assistant", "content": "虎头虎脑"}]
-                                                 ),
+         history: List[History] = Body([],
+                                    description="历史对话",
+                                    example=[
+                                        {"role": "user", "content": "我们来玩成语接龙，我先来，生龙活虎"},
+                                        {"role": "assistant", "content": "虎头虎脑"}]
+                                    ),
          ):
     async def chat_iterator(query: str,
-                            history: Optional[List[History]]
+                            history: List[History] = [],
                             ) -> AsyncIterable[str]:
         callback = AsyncIteratorCallbackHandler()
 
diff --git a/server/chat/knowledge_base_chat.py b/server/chat/knowledge_base_chat.py
index 1a00abf..5c49175 100644
--- a/server/chat/knowledge_base_chat.py
+++ b/server/chat/knowledge_base_chat.py
@@ -19,14 +19,14 @@ import json
 def knowledge_base_chat(query: str = Body(..., description="用户输入", example="你好"),
                         knowledge_base_name: str = Body(..., description="知识库名称", example="samples"),
                         top_k: int = Body(VECTOR_SEARCH_TOP_K, description="匹配向量数"),
-                        history: Optional[List[History]] = Body(...,
-                                                                description="历史对话",
-                                                                example=[
-                                                                    {"role": "user",
-                                                                     "content": "我们来玩成语接龙，我先来，生龙活虎"},
-                                                                    {"role": "assistant",
-                                                                     "content": "虎头虎脑"}]
-                                                                ),
+                        history: List[History] = Body([],
+                                                    description="历史对话",
+                                                    example=[
+                                                        {"role": "user",
+                                                            "content": "我们来玩成语接龙，我先来，生龙活虎"},
+                                                        {"role": "assistant",
+                                                            "content": "虎头虎脑"}]
+                                                    ),
                         ):
     kb = KBServiceFactory.get_service_by_name(knowledge_base_name)
     if kb is None: