diff --git a/webui_pages/utils.py b/webui_pages/utils.py
index fc1253a..1f7ab5d 100644
--- a/webui_pages/utils.py
+++ b/webui_pages/utils.py
@@ -8,12 +8,15 @@ from configs.model_config import (
     KB_ROOT_PATH,
     LLM_MODEL,
     llm_model_dict,
+    VECTOR_SEARCH_TOP_K,
+    SEARCH_ENGINE_TOP_K,
 )
 import httpx
 import asyncio
 from server.chat.openai_chat import OpenAiChatMsgIn
 from fastapi.responses import StreamingResponse
 import contextlib
+import json
 
 
 def set_httpx_timeout(timeout=60.0):
@@ -30,26 +33,6 @@ KB_ROOT_PATH = Path(KB_ROOT_PATH)
 set_httpx_timeout()
 
 
-def get_kb_list() -> List[str]:
-    '''
-    获取知识库列表
-    '''
-    kb_list = os.listdir(KB_ROOT_PATH)
-    return [x for x in kb_list if (KB_ROOT_PATH / x).is_dir()]
-
-
-def get_kb_files(kb: str) -> List[str]:
-    '''
-    获取某个知识库下包含的所有文件（只包括根目录一级）
-    '''
-    kb = KB_ROOT_PATH / kb / "content"
-    if kb.is_dir():
-        kb_files = os.listdir(kb)
-        return kb_files
-    else:
-        return []
-
-
 def run_async(cor):
     '''
     在同步环境中运行异步代码.
@@ -174,7 +157,7 @@ class ApiRequest:
                 except:
                     retry -= 1
 
-    def _fastapi_stream2generator(self, response: StreamingResponse):
+    def _fastapi_stream2generator(self, response: StreamingResponse, as_json: bool =False):
         '''
         将api.py中视图函数返回的StreamingResponse转化为同步生成器
         '''
@@ -182,15 +165,27 @@ class ApiRequest:
             loop = asyncio.get_event_loop()
         except:
             loop = asyncio.new_event_loop()
-        return iter_over_async(response.body_iterator, loop)
+        
+        for chunk in  iter_over_async(response.body_iterator, loop):
+            if as_json and chunk:
+                yield json.loads(chunk)
+            else:
+                yield chunk
 
-    def _httpx_stream2generator(self,response: contextlib._GeneratorContextManager):
+    def _httpx_stream2generator(
+        self,
+        response: contextlib._GeneratorContextManager,
+        as_json: bool = False,
+    ):
         '''
         将httpx.stream返回的GeneratorContextManager转化为普通生成器
         '''
         with response as r:
             for chunk in r.iter_text(None):
-                yield chunk
+                if as_json and chunk:
+                    yield json.loads(chunk)
+                else:
+                    yield chunk
 
     # 对话相关操作
 
@@ -254,7 +249,7 @@ class ApiRequest:
         self,
         query: str,
         knowledge_base_name: str,
-        top_k: int = 3,
+        top_k: int = VECTOR_SEARCH_TOP_K,
         no_remote_api: bool = None,
     ):
         '''
@@ -266,20 +261,20 @@ class ApiRequest:
         if no_remote_api:
             from server.chat.knowledge_base_chat import knowledge_base_chat
             response = knowledge_base_chat(query, knowledge_base_name, top_k)
-            return self._fastapi_stream2generator(response)
+            return self._fastapi_stream2generator(response, as_json=True)
         else:
             response = self.post(
                 "/chat/knowledge_base_chat",
                 json={"query": query, "knowledge_base_name": knowledge_base_name, "top_k": top_k},
                 stream=True,
             )
-            return self._httpx_stream2generator(response)
+            return self._httpx_stream2generator(response, as_json=True)
 
     def search_engine_chat(
         self,
         query: str,
         search_engine_name: str,
-        top_k: int,
+        top_k: int = SEARCH_ENGINE_TOP_K,
         no_remote_api: bool = None,
     ):
         '''
@@ -291,14 +286,14 @@ class ApiRequest:
         if no_remote_api:
             from server.chat.search_engine_chat import search_engine_chat
             response = search_engine_chat(query, search_engine_name, top_k)
-            return self._fastapi_stream2generator(response)
+            return self._fastapi_stream2generator(response, as_json=True)
         else:
             response = self.post(
                 "/chat/search_engine_chat",
                 json={"query": query, "search_engine_name": search_engine_name, "top_k": top_k},
                 stream=True,
             )
-            return self._httpx_stream2generator(response)
+            return self._httpx_stream2generator(response, as_json=True)
 
     # 知识库相关操作