diff --git a/server/api.py b/server/api.py
index e5d9830..873b887 100644
--- a/server/api.py
+++ b/server/api.py
@@ -71,7 +71,7 @@ def create_app():
              summary="创建知识库"
              )(create_kb)
 
-    app.delete("/knowledge_base/delete_knowledge_base",
+    app.post("/knowledge_base/delete_knowledge_base",
                tags=["Knowledge Base Management"],
                response_model=BaseResponse,
                summary="删除知识库"
@@ -89,7 +89,7 @@ def create_app():
              summary="上传文件到知识库"
              )(upload_doc)
 
-    app.delete("/knowledge_base/delete_doc",
+    app.post("/knowledge_base/delete_doc",
                tags=["Knowledge Base Management"],
                response_model=BaseResponse,
                summary="删除知识库内指定文件"
@@ -106,10 +106,6 @@ def create_app():
              summary="根据content中文档重建向量库，流式输出处理进度。"
              )(recreate_vector_store)
 
-    # init local vector store info to database
-    from webui_pages.utils import init_vs_database
-    init_vs_database()
-
     return app
 
 
diff --git a/server/db/repository/knowledge_base_repository.py b/server/db/repository/knowledge_base_repository.py
index 9f5ad40..585fd9b 100644
--- a/server/db/repository/knowledge_base_repository.py
+++ b/server/db/repository/knowledge_base_repository.py
@@ -9,6 +9,9 @@ def add_kb_to_db(session, kb_name, vs_type, embed_model):
     if not kb:
         kb = KnowledgeBaseModel(kb_name=kb_name, vs_type=vs_type, embed_model=embed_model)
         session.add(kb)
+    else: # update kb with new vs_type and embed_model
+        kb.vs_type = vs_type
+        kb.embed_model = embed_model
     return True
 
 
diff --git a/server/knowledge_base/kb_service/base.py b/server/knowledge_base/kb_service/base.py
index a9b102f..c22bac7 100644
--- a/server/knowledge_base/kb_service/base.py
+++ b/server/knowledge_base/kb_service/base.py
@@ -1,16 +1,25 @@
 from abc import ABC, abstractmethod
 
 import os
+import pandas as pd
 
 from langchain.embeddings.base import Embeddings
 from langchain.docstore.document import Document
+from server.db.repository.knowledge_base_repository import (
+    add_kb_to_db, delete_kb_from_db, list_kbs_from_db, kb_exists,
+    load_kb_from_db, get_kb_detail,
+)
+from server.db.repository.knowledge_file_repository import (
+    add_doc_to_db, delete_file_from_db, doc_exists,
+    list_docs_from_db, get_file_detail
+)
 
-from server.db.repository.knowledge_base_repository import add_kb_to_db, delete_kb_from_db, list_kbs_from_db, kb_exists, load_kb_from_db
-from server.db.repository.knowledge_file_repository import add_doc_to_db, delete_file_from_db, doc_exists, \
-    list_docs_from_db
 from configs.model_config import (kbs_config, VECTOR_SEARCH_TOP_K,
                                   EMBEDDING_DEVICE, EMBEDDING_MODEL)
-from server.knowledge_base.utils import (get_kb_path, get_doc_path, load_embeddings, KnowledgeFile)
+from server.knowledge_base.utils import (
+    get_kb_path, get_doc_path, load_embeddings, KnowledgeFile,
+    list_kbs_from_folder, list_docs_from_folder,
+)
 from typing import List, Union
 
 
@@ -77,10 +86,10 @@ class KBService(ABC):
         """
         从知识库删除文件
         """
-        if delete_content and os.path.exists(kb_file.filepath):
-            os.remove(kb_file.filepath)
         self.do_delete_doc(kb_file)
         status = delete_file_from_db(kb_file)
+        if delete_content and os.path.exists(kb_file.filepath):
+            os.remove(kb_file.filepath)
         return status
 
     def update_doc(self, kb_file: KnowledgeFile):
@@ -121,10 +130,9 @@ class KBService(ABC):
     def list_kbs(cls):
         return list_kbs_from_db()
 
-    @classmethod
-    def exists(cls,
-               knowledge_base_name: str):
-        return kb_exists(knowledge_base_name)
+    def exists(self, kb_name: str = None):
+        kb_name = kb_name or self.kb_name
+        return kb_exists(kb_name)
 
     @abstractmethod
     def vs_type(self) -> str:
@@ -212,3 +220,86 @@ class KBServiceFactory:
     def get_default():
         return KBServiceFactory.get_service("default", SupportedVSType.DEFAULT)
 
+
+def get_kb_details() -> pd.DataFrame:
+    kbs_in_folder = list_kbs_from_folder()
+    kbs_in_db = KBService.list_kbs()
+    result = {}
+
+    for kb in kbs_in_folder:
+        result[kb] = {
+            "kb_name": kb,
+            "vs_type": "",
+            "embed_model": "",
+            "file_count": 0,
+            "create_time": None,
+            "in_folder": True,
+            "in_db": False,
+        }
+
+    for kb in kbs_in_db:
+        kb_detail = get_kb_detail(kb)
+        if kb_detail:
+            kb_detail["in_db"] = True
+            if kb in result:
+                result[kb].update(kb_detail)
+            else:
+                kb_detail["in_folder"] = False
+                result[kb] = kb_detail
+
+    df = pd.DataFrame(result.values(), columns=[
+            "kb_name",
+            "vs_type",
+            "embed_model",
+            "file_count",
+            "create_time",
+            "in_folder",
+            "in_db",
+    ])
+    df.insert(0, "No", range(1, len(df) + 1))
+    return df
+
+
+def get_kb_doc_details(kb_name: str) -> pd.DataFrame:
+    kb = KBServiceFactory.get_service_by_name(kb_name)
+    docs_in_folder = list_docs_from_folder(kb_name)
+    docs_in_db = kb.list_docs()
+    result = {}
+
+    for doc in docs_in_folder:
+        result[doc] = {
+            "kb_name": kb_name,
+            "file_name": doc,
+            "file_ext": os.path.splitext(doc)[-1],
+            "file_version": 0,
+            "document_loader": "",
+            "text_splitter": "",
+            "create_time": None,
+            "in_folder": True,
+            "in_db": False,
+        }
+
+    for doc in docs_in_db:
+        doc_detail = get_file_detail(kb_name, doc)
+        if doc_detail:
+            doc_detail["in_db"] = True
+            if doc in result:
+                result[doc].update(doc_detail)
+            else:
+                doc_detail["in_folder"] = False
+                result[doc] = doc_detail
+
+    df = pd.DataFrame(result.values(), columns=[
+            "kb_name",
+            "file_name",
+            "file_ext",
+            "file_version",
+            "document_loader",
+            "text_splitter",
+            "create_time",
+            "in_folder",
+            "in_db",
+    ])
+    df.insert(0, "No", range(1, len(df) + 1))
+    return df
+
diff --git a/server/knowledge_base/migrate.py b/server/knowledge_base/migrate.py
index 721862a..29f274e 100644
--- a/server/knowledge_base/migrate.py
+++ b/server/knowledge_base/migrate.py
@@ -70,7 +70,6 @@ def folder2db(
 
 
 def recreate_all_vs(
-    mode: Literal["recreate_vs", "fill_info_only", "update_in_db", "increament"],
     vs_type: Literal["faiss", "milvus", "pg", "chromadb"] = DEFAULT_VS_TYPE,
     embed_mode: str = EMBEDDING_MODEL,
 ):
@@ -78,7 +77,7 @@ def recreate_all_vs(
     used to recreate a vector store or change current vector store to another type or embed_model
     '''
     for kb_name in list_kbs_from_folder():
-        folder2db(kb_name, mode, vs_type, embed_mode)
+        folder2db(kb_name, "recreate_vs", vs_type, embed_mode)
 
 
 def prune_db_docs(kb_name: str):
diff --git a/server/knowledge_base/utils.py b/server/knowledge_base/utils.py
index a6ff4b8..3e8be26 100644
--- a/server/knowledge_base/utils.py
+++ b/server/knowledge_base/utils.py
@@ -52,7 +52,6 @@ LOADER_DICT = {"UnstructuredFileLoader": ['.eml', '.html', '.json', '.md', '.msg
                                           '.ppt', '.pptx', '.tsv'],  # '.pdf', '.xlsx', '.csv'
                "CSVLoader": [".csv"],
                "PyPDFLoader": [".pdf"],
-
                }
 SUPPORTED_EXTS = [ext for sublist in LOADER_DICT.values() for ext in sublist]
 
diff --git a/server/utils.py b/server/utils.py
index 7228930..e1a23d1 100644
--- a/server/utils.py
+++ b/server/utils.py
@@ -5,6 +5,7 @@ import torch
 from fastapi_offline import FastAPIOffline
 import fastapi_offline
 from pathlib import Path
+import asyncio
 
 
 # patch fastapi_offline to use local static assests
@@ -82,3 +83,32 @@ def torch_gc():
         except Exception as e:
             print(e)
             print("如果您使用的是 macOS 建议将 pytorch 版本升级至 2.0.0 或更高版本，以支持及时清理 torch 产生的内存占用。")
+
+
+def run_async(cor):
+    '''
+    在同步环境中运行异步代码.
+    '''
+    try:
+        loop = asyncio.get_event_loop()
+    except:
+        loop = asyncio.new_event_loop()
+    return loop.run_until_complete(cor)
+
+
+def iter_over_async(ait, loop):
+    '''
+    将异步生成器封装成同步生成器.
+    '''
+    ait = ait.__aiter__()
+    async def get_next():
+        try:
+            obj = await ait.__anext__()
+            return False, obj
+        except StopAsyncIteration:
+            return True, None
+    while True:
+        done, obj = loop.run_until_complete(get_next())
+        if done:
+            break
+        yield obj
diff --git a/webui.py b/webui.py
index 559b74a..c742437 100644
--- a/webui.py
+++ b/webui.py
@@ -12,9 +12,6 @@ from webui_pages import *
 api = ApiRequest(base_url="http://127.0.0.1:7861", no_remote_api=False)
 
 if __name__ == "__main__":
-    # init local vector store info to database
-    init_vs_database()
-
     st.set_page_config("langchain-chatglm WebUI")
 
     if not chat_box.chat_inited:
diff --git a/webui_pages/dialogue/dialogue.py b/webui_pages/dialogue/dialogue.py
index 3b7a445..86bf499 100644
--- a/webui_pages/dialogue/dialogue.py
+++ b/webui_pages/dialogue/dialogue.py
@@ -86,12 +86,11 @@ def dialogue_page(api: ApiRequest):
                                  ["LLM 对话",
                                   "知识库问答",
                                   "搜索引擎问答",
-                                  ],
-                                 on_change=on_mode_change,
-                                 key="dialogue_mode",
-                                 )
-        history_len = st.slider("历史对话轮数：", 1, 10, 3)
-
+                                ],
+                                on_change=on_mode_change,
+                                key="dialogue_mode",
+                                )
+        history_len = st.slider("历史对话轮数：", 0, 10, 3)
         # todo: support history len
 
         def on_kb_change():
diff --git a/webui_pages/knowledge_base/knowledge_base.py b/webui_pages/knowledge_base/knowledge_base.py
index cb61178..a790bcf 100644
--- a/webui_pages/knowledge_base/knowledge_base.py
+++ b/webui_pages/knowledge_base/knowledge_base.py
@@ -1,11 +1,10 @@
 import streamlit as st
 from webui_pages.utils import *
-# import streamlit_antd_components as sac
 from st_aggrid import AgGrid
 from st_aggrid.grid_options_builder import GridOptionsBuilder
 import pandas as pd
 from server.knowledge_base.utils import get_file_path
-# from streamlit_chatbox import *
+from server.knowledge_base.kb_service.base import get_kb_details, get_kb_doc_details
 from typing import Literal, Dict, Tuple
 
 SENTENCE_SIZE = 100
@@ -33,7 +32,7 @@ def config_aggrid(
 
 def knowledge_base_page(api: ApiRequest):
     # api = ApiRequest(base_url="http://127.0.0.1:7861", no_remote_api=True)
-    kb_details = get_kb_details(api)
+    kb_details = get_kb_details()
     kb_list = list(kb_details.kb_name)
 
     cols = st.columns([3, 1, 1])
@@ -127,7 +126,7 @@ def knowledge_base_page(api: ApiRequest):
             # 知识库详情
             st.write(f"知识库 `{kb}` 详情:")
             st.info("请选择文件")
-            doc_details = get_kb_doc_details(api, kb)
+            doc_details = get_kb_doc_details(kb)
             doc_details.drop(columns=["kb_name"], inplace=True)
 
             gb = config_aggrid(
diff --git a/webui_pages/utils.py b/webui_pages/utils.py
index 6dac5a9..1432326 100644
--- a/webui_pages/utils.py
+++ b/webui_pages/utils.py
@@ -1,7 +1,6 @@
 # 该文件包含webui通用工具，可以被不同的webui使用
 from typing import *
 from pathlib import Path
-import os
 from configs.model_config import (
     EMBEDDING_MODEL,
     KB_ROOT_PATH,
@@ -17,10 +16,9 @@ from fastapi.responses import StreamingResponse
 import contextlib
 import json
 from io import BytesIO
-import pandas as pd
-from server.knowledge_base.utils import list_kbs_from_folder, list_docs_from_folder
 from server.db.repository.knowledge_base_repository import get_kb_detail
 from server.db.repository.knowledge_file_repository import get_file_detail
+from server.utils import run_async, iter_over_async
 
 
 def set_httpx_timeout(timeout=60.0):
@@ -37,35 +35,6 @@ KB_ROOT_PATH = Path(KB_ROOT_PATH)
 set_httpx_timeout()
 
 
-def run_async(cor):
-    '''
-    在同步环境中运行异步代码.
-    '''
-    try:
-        loop = asyncio.get_event_loop()
-    except:
-        loop = asyncio.new_event_loop()
-    return loop.run_until_complete(cor)
-
-
-def iter_over_async(ait, loop):
-    '''
-    将异步生成器封装成同步生成器.
-    '''
-    ait = ait.__aiter__()
-    async def get_next():
-        try:
-            obj = await ait.__anext__()
-            return False, obj
-        except StopAsyncIteration:
-            return True, None
-    while True:
-        done, obj = loop.run_until_complete(get_next())
-        if done:
-            break
-        yield obj
-
-
 class ApiRequest:
     '''
     api.py调用的封装,主要实现:
@@ -97,13 +66,17 @@ class ApiRequest:
         url: str,
         params: Union[Dict, List[Tuple], bytes] = None,
         retry: int = 3,
+        stream: bool = False,
         **kwargs: Any,
     ) -> Union[httpx.Response, None]:
         url = self._parse_url(url)
         kwargs.setdefault("timeout", self.timeout)
         while retry > 0:
             try:
-                return httpx.get(url, params=params, **kwargs)
+                if stream:
+                    return httpx.stream("GET", url, params=params, **kwargs)
+                else:
+                    return httpx.get(url, params=params, **kwargs)
             except:
                 retry -= 1
 
@@ -112,6 +85,7 @@ class ApiRequest:
         url: str,
         params: Union[Dict, List[Tuple], bytes] = None,
         retry: int = 3,
+        stream: bool = False,
         **kwargs: Any,
     ) -> Union[httpx.Response, None]:
         rl = self._parse_url(url)
@@ -119,7 +93,10 @@ class ApiRequest:
         async with httpx.AsyncClient() as client:
             while retry > 0:
                 try:
-                    return await client.get(url, params=params, **kwargs)
+                    if stream:
+                        return await client.stream("GET", url, params=params, **kwargs)
+                    else:
+                        return await client.get(url, params=params, **kwargs)
                 except:
                     retry -= 1
 
@@ -150,6 +127,7 @@ class ApiRequest:
         data: Dict = None,
         json: Dict = None,
         retry: int = 3,
+        stream: bool = False,
         **kwargs: Any
     ) -> Union[httpx.Response, None]:
         rl = self._parse_url(url)
@@ -157,7 +135,51 @@ class ApiRequest:
         async with httpx.AsyncClient() as client:
             while retry > 0:
                 try:
-                    return await client.post(url, data=data, json=json, **kwargs)
+                    if stream:
+                        return await client.stream("POST", url, data=data, json=json, **kwargs)
+                    else:
+                        return await client.post(url, data=data, json=json, **kwargs)
+                except:
+                    retry -= 1
+
+    def delete(
+        self,
+        url: str,
+        data: Dict = None,
+        json: Dict = None,
+        retry: int = 3,
+        stream: bool = False,
+        **kwargs: Any
+    ) -> Union[httpx.Response, None]:
+        url = self._parse_url(url)
+        kwargs.setdefault("timeout", self.timeout)
+        while retry > 0:
+            try:
+                if stream:
+                    return httpx.stream("DELETE", url, data=data, json=json, **kwargs)
+                else:
+                    return httpx.delete(url, data=data, json=json, **kwargs)
+            except:
+                retry -= 1
+
+    async def adelete(
+        self,
+        url: str,
+        data: Dict = None,
+        json: Dict = None,
+        retry: int = 3,
+        stream: bool = False,
+        **kwargs: Any
+    ) -> Union[httpx.Response, None]:
+        rl = self._parse_url(url)
+        kwargs.setdefault("timeout", self.timeout)
+        async with httpx.AsyncClient() as client:
+            while retry > 0:
+                try:
+                    if stream:
+                        return await client.stream("DELETE", url, data=data, json=json, **kwargs)
+                    else:
+                        return await client.delete(url, data=data, json=json, **kwargs)
                 except:
                     retry -= 1
 
@@ -384,7 +406,7 @@ class ApiRequest:
             response = run_async(delete_kb(knowledge_base_name))
             return response.dict()
         else:
-            response = self.delete(
+            response = self.post(
                 "/knowledge_base/delete_knowledge_base",
                 json={"knowledge_base_name": knowledge_base_name},
             )
@@ -480,7 +502,7 @@ class ApiRequest:
             response = run_async(delete_doc(**data))
             return response.dict()
         else:
-            response = self.delete(
+            response = self.post(
                 "/knowledge_base/delete_doc",
                 json=data,
             )
@@ -489,7 +511,7 @@ class ApiRequest:
     def update_kb_doc(
         self,
         knowledge_base_name: str,
-        doc_name: str,
+        file_name: str,
         no_remote_api: bool = None,
     ):
         '''
@@ -500,12 +522,12 @@ class ApiRequest:
 
         if no_remote_api:
             from server.knowledge_base.kb_doc_api import update_doc
-            response = run_async(update_doc(knowledge_base_name, doc_name))
+            response = run_async(update_doc(knowledge_base_name, file_name))
             return response.dict()
         else:
-            response = self.delete(
+            response = self.post(
                 "/knowledge_base/update_doc",
-                json={"knowledge_base_name": knowledge_base_name, "doc_name": doc_name},
+                json={"knowledge_base_name": knowledge_base_name, "file_name": file_name},
             )
             return response.json()
 
@@ -532,120 +554,8 @@ class ApiRequest:
             return self._httpx_stream2generator(response, as_json=True)
 
 
-def get_kb_details(api: ApiRequest) -> pd.DataFrame:
-    kbs_in_folder = list_kbs_from_folder()
-    kbs_in_db = api.list_knowledge_bases()
-    result = {}
-
-    for kb in kbs_in_folder:
-        result[kb] = {
-            "kb_name": kb,
-            "vs_type": "",
-            "embed_model": "",
-            "file_count": 0,
-            "create_time": None,
-            "in_folder": True,
-            "in_db": False,
-        }
-    
-    for kb in kbs_in_db:
-        kb_detail = get_kb_detail(kb)
-        if kb_detail:
-            kb_detail["in_db"] = True
-            if kb in result:
-                result[kb].update(kb_detail)
-            else:
-                kb_detail["in_folder"] = False
-                result[kb] = kb_detail
-
-    df = pd.DataFrame(result.values(), columns=[
-            "kb_name",
-            "vs_type",
-            "embed_model",
-            "file_count",
-            "create_time",
-            "in_folder",
-            "in_db",
-    ])
-    df.insert(0, "No", range(1, len(df) + 1))
-    return df
-
-
-def get_kb_doc_details(api: ApiRequest, kb: str) -> pd.DataFrame:
-    docs_in_folder = list_docs_from_folder(kb)
-    docs_in_db = api.list_kb_docs(kb)
-    result = {}
-
-    for doc in docs_in_folder:
-        result[doc] = {
-            "kb_name": kb,
-            "file_name": doc,
-            "file_ext": os.path.splitext(doc)[-1],
-            "file_version": 0,
-            "document_loader": "",
-            "text_splitter": "",
-            "create_time": None,
-            "in_folder": True,
-            "in_db": False,
-        }
-    
-    for doc in docs_in_db:
-        doc_detail = get_file_detail(kb, doc)
-        if doc_detail:
-            doc_detail["in_db"] = True
-            if doc in result:
-                result[doc].update(doc_detail)
-            else:
-                doc_detail["in_folder"] = False
-                result[doc] = doc_detail
-
-    df = pd.DataFrame(result.values(), columns=[
-            "kb_name",
-            "file_name",
-            "file_ext",
-            "file_version",
-            "document_loader",
-            "text_splitter",
-            "create_time",
-            "in_folder",
-            "in_db",        
-    ])
-    df.insert(0, "No", range(1, len(df) + 1))
-    return df
-
-
-def init_vs_database(recreate_vs: bool = False):
-    '''
-    init local vector store info to database
-    '''
-    from server.db.base import Base, engine
-    from server.db.repository.knowledge_base_repository import add_kb_to_db, kb_exists
-    from server.db.repository.knowledge_file_repository import add_doc_to_db
-    from server.knowledge_base.utils import KnowledgeFile
-
-    Base.metadata.create_all(bind=engine)
-
-    if recreate_vs:
-        api = ApiRequest(no_remote_api=True)
-        for kb in list_kbs_from_folder():
-            for t in api.recreate_vector_store(kb):
-                print(t)
-    else: # add vs info to db only
-        for kb in list_kbs_from_folder():
-            if not kb_exists(kb):
-                add_kb_to_db(kb, "faiss", EMBEDDING_MODEL)
-                for doc in list_docs_from_folder(kb):
-                    try:
-                        kb_file = KnowledgeFile(doc, kb)
-                        add_doc_to_db(kb_file)
-                    except Exception as e:
-                        print(e)
-
-
 if __name__ == "__main__":
     api = ApiRequest(no_remote_api=True)
-    # init vector store database
-    init_vs_database()
 
     # print(api.chat_fastchat(
     #     messages=[{"role": "user", "content": "hello"}]