diff --git a/server/chat/knowledge_base_chat.py b/server/chat/knowledge_base_chat.py
index 852e9ca..d32c497 100644
--- a/server/chat/knowledge_base_chat.py
+++ b/server/chat/knowledge_base_chat.py
@@ -52,6 +52,7 @@ def knowledge_base_chat(query: str = Body(..., description="用户输入", examp
                         ):
     async def knowledge_base_chat_iterator(query: str,
                                            knowledge_base_name: str,
+                                           top_k: int,
                                            ) -> AsyncIterable[str]:
         callback = AsyncIteratorCallbackHandler()
         model = ChatOpenAI(
@@ -62,7 +63,6 @@ def knowledge_base_chat(query: str = Body(..., description="用户输入", examp
             openai_api_base=llm_model_dict[LLM_MODEL]["api_base_url"],
             model_name=LLM_MODEL
         )
-
         docs = lookup_vs(query, knowledge_base_name, top_k)
         context = "\n".join([doc.page_content for doc in docs])
         prompt = PromptTemplate(template=PROMPT_TEMPLATE, input_variables=["context", "question"])
@@ -80,4 +80,4 @@ def knowledge_base_chat(query: str = Body(..., description="用户输入", examp
             yield token
         await task
 
-    return StreamingResponse(knowledge_base_chat_iterator(query, knowledge_base_name), media_type="text/event-stream")
+    return StreamingResponse(knowledge_base_chat_iterator(query, knowledge_base_name, top_k), media_type="text/event-stream")
diff --git a/webui_pages/dialogue/dialogue.py b/webui_pages/dialogue/dialogue.py
index ea0f3b6..097b50f 100644
--- a/webui_pages/dialogue/dialogue.py
+++ b/webui_pages/dialogue/dialogue.py
@@ -10,6 +10,7 @@ chat_box = ChatBox(
 )
 
 def dialogue_page(api: ApiRequest):
+    chat_box.init_session()
     with st.sidebar:
         def on_mode_change():
             mode = st.session_state.dialogue_mode
diff --git a/webui_pages/utils.py b/webui_pages/utils.py
index 747b685..2089179 100644
--- a/webui_pages/utils.py
+++ b/webui_pages/utils.py
@@ -254,6 +254,7 @@ class ApiRequest:
         self,
         query: str,
         knowledge_base_name: str,
+        top_k: int = 3,
         no_remote_api: bool = None,
     ):
         '''
@@ -264,12 +265,12 @@ class ApiRequest:
 
         if no_remote_api:
             from server.chat.knowledge_base_chat import knowledge_base_chat
-            response = knowledge_base_chat(query, knowledge_base_name)
+            response = knowledge_base_chat(query, knowledge_base_name, top_k)
             return self._fastapi_stream2generator(response)
         else:
             response = self.post(
                 "/chat/knowledge_base_chat",
-                json={"query": query, "knowledge_base_name": knowledge_base_name},
+                json={"query": query, "knowledge_base_name": knowledge_base_name, "top_k": top_k},
                 stream=True,
             )
             return self._httpx_stream2generator(response)