diff --git a/requirements.txt b/requirements.txt
index f2e1d65..6c013e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,6 @@ fschat==0.2.20
 transformers
 torch~=2.0.0
 fastapi~=0.99.1
-fastapi-offline
 nltk~=3.8.1
 uvicorn~=0.23.1
 starlette~=0.27.0
diff --git a/requirements_api.txt b/requirements_api.txt
index f077c94..9b45aac 100644
--- a/requirements_api.txt
+++ b/requirements_api.txt
@@ -5,7 +5,6 @@ fschat==0.2.20
 transformers
 torch~=2.0.0
 fastapi~=0.99.1
-fastapi-offline
 nltk~=3.8.1
 uvicorn~=0.23.1
 starlette~=0.27.0
diff --git a/server/api.py b/server/api.py
index 458b1d7..800680c 100644
--- a/server/api.py
+++ b/server/api.py
@@ -7,15 +7,17 @@ sys.path.append(os.path.dirname(os.path.dirname(__file__)))
 from configs.model_config import NLTK_DATA_PATH, OPEN_CROSS_DOMAIN
 import argparse
 import uvicorn
-from server.utils import FastAPIOffline as FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from starlette.responses import RedirectResponse
 from server.chat import (chat, knowledge_base_chat, openai_chat,
                          search_engine_chat)
 from server.knowledge_base.kb_api import list_kbs, create_kb, delete_kb
 from server.knowledge_base.kb_doc_api import (list_docs, upload_doc, delete_doc,
-                                              update_doc, download_doc, recreate_vector_store)
-from server.utils import BaseResponse, ListResponse
+                                              update_doc, download_doc, recreate_vector_store,
+                                               search_docs, DocumentWithScore)
+from server.utils import BaseResponse, ListResponse, FastAPI, MakeFastAPIOffline
+from typing import List
+
 
 nltk.data.path = [NLTK_DATA_PATH] + nltk.data.path
 
@@ -25,7 +27,8 @@ async def document():
 
 
 def create_app():
-    app = FastAPI()
+    app = FastAPI(title="Langchain-Chatchat API Server")
+    MakeFastAPIOffline(app)
     # Add CORS middleware to allow all origins
     # 在config.py中设置OPEN_DOMAIN=True，允许跨域
     # set OPEN_DOMAIN=True in config.py to allow cross-domain
@@ -83,6 +86,12 @@ def create_app():
             summary="获取知识库内的文件列表"
             )(list_docs)
 
+    app.post("/knowledge_base/search_docs",
+            tags=["Knowledge Base Management"],
+            response_model=List[DocumentWithScore],
+            summary="搜索知识库"
+            )(search_docs)
+
     app.post("/knowledge_base/upload_doc",
              tags=["Knowledge Base Management"],
              response_model=BaseResponse,
diff --git a/server/chat/knowledge_base_chat.py b/server/chat/knowledge_base_chat.py
index 0ecabf0..84c62f0 100644
--- a/server/chat/knowledge_base_chat.py
+++ b/server/chat/knowledge_base_chat.py
@@ -1,26 +1,27 @@
 from fastapi import Body, Request
 from fastapi.responses import StreamingResponse
 from configs.model_config import (llm_model_dict, LLM_MODEL, PROMPT_TEMPLATE,
-                                  VECTOR_SEARCH_TOP_K)
+                                  VECTOR_SEARCH_TOP_K, SCORE_THRESHOLD)
 from server.chat.utils import wrap_done
 from server.utils import BaseResponse
 from langchain.chat_models import ChatOpenAI
 from langchain import LLMChain
 from langchain.callbacks import AsyncIteratorCallbackHandler
-from typing import AsyncIterable
+from typing import AsyncIterable, List, Optional
 import asyncio
 from langchain.prompts.chat import ChatPromptTemplate
-from typing import List, Optional
 from server.chat.utils import History
 from server.knowledge_base.kb_service.base import KBService, KBServiceFactory
 import json
 import os
 from urllib.parse import urlencode
+from server.knowledge_base.kb_doc_api import search_docs
 
 
 def knowledge_base_chat(query: str = Body(..., description="用户输入", examples=["你好"]),
                         knowledge_base_name: str = Body(..., description="知识库名称", examples=["samples"]),
                         top_k: int = Body(VECTOR_SEARCH_TOP_K, description="匹配向量数"),
+                        score_threshold: float = Body(SCORE_THRESHOLD, description="知识库匹配相关度阈值，取值范围在0-1之间，SCORE越小，相关度越高，取到1相当于不筛选，建议设置在0.5左右", ge=0, le=1),
                         history: List[History] = Body([],
                                                       description="历史对话",
                                                       examples=[[
@@ -53,7 +54,7 @@ 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 = kb.search_docs(query, top_k)
+        docs = search_docs(query, knowledge_base_name, top_k, score_threshold)
         context = "\n".join([doc.page_content for doc in docs])
 
         chat_prompt = ChatPromptTemplate.from_messages(
diff --git a/server/knowledge_base/kb_doc_api.py b/server/knowledge_base/kb_doc_api.py
index 3f27fb1..0bf2cb7 100644
--- a/server/knowledge_base/kb_doc_api.py
+++ b/server/knowledge_base/kb_doc_api.py
@@ -1,13 +1,32 @@
 import os
 import urllib
 from fastapi import File, Form, Body, Query, UploadFile
-from configs.model_config import DEFAULT_VS_TYPE, EMBEDDING_MODEL
+from configs.model_config import (DEFAULT_VS_TYPE, EMBEDDING_MODEL, VECTOR_SEARCH_TOP_K, SCORE_THRESHOLD)
 from server.utils import BaseResponse, ListResponse
 from server.knowledge_base.utils import validate_kb_name, list_docs_from_folder, KnowledgeFile
 from fastapi.responses import StreamingResponse, FileResponse
 import json
 from server.knowledge_base.kb_service.base import KBServiceFactory
-from typing import List
+from typing import List, Dict
+from langchain.docstore.document import Document
+
+
+class DocumentWithScore(Document):
+    score: float = None
+
+
+def search_docs(query: str = Body(..., description="用户输入", examples=["你好"]),
+                knowledge_base_name: str = Body(..., description="知识库名称", examples=["samples"]),
+                top_k: int = Body(VECTOR_SEARCH_TOP_K, description="匹配向量数"),
+                score_threshold: float = Body(SCORE_THRESHOLD, description="知识库匹配相关度阈值，取值范围在0-1之间，SCORE越小，相关度越高，取到1相当于不筛选，建议设置在0.5左右", ge=0, le=1),
+                ) -> List[DocumentWithScore]:
+    kb = KBServiceFactory.get_service_by_name(knowledge_base_name)
+    if kb is None:
+        return {"code": 404, "msg": f"未找到知识库 {knowledge_base_name}", "docs": []}
+    docs = kb.search_docs(query, top_k, score_threshold)
+    data = [DocumentWithScore(**x[0].dict(), score=x[1]) for x in docs]
+
+    return data
 
 
 async def list_docs(
diff --git a/server/knowledge_base/kb_service/base.py b/server/knowledge_base/kb_service/base.py
index ec1c692..d506f63 100644
--- a/server/knowledge_base/kb_service/base.py
+++ b/server/knowledge_base/kb_service/base.py
@@ -13,7 +13,7 @@ from server.db.repository.knowledge_file_repository import (
     list_docs_from_db, get_file_detail, delete_file_from_db
 )
 
-from configs.model_config import (kbs_config, VECTOR_SEARCH_TOP_K,
+from configs.model_config import (kbs_config, VECTOR_SEARCH_TOP_K, SCORE_THRESHOLD,
                                   EMBEDDING_DEVICE, EMBEDDING_MODEL)
 from server.knowledge_base.utils import (
     get_kb_path, get_doc_path, load_embeddings, KnowledgeFile,
@@ -112,9 +112,10 @@ class KBService(ABC):
     def search_docs(self,
                     query: str,
                     top_k: int = VECTOR_SEARCH_TOP_K,
+                    score_threshold: float = SCORE_THRESHOLD,
                     ):
         embeddings = self._load_embeddings()
-        docs = self.do_search(query, top_k, embeddings)
+        docs = self.do_search(query, top_k, score_threshold, embeddings)
         return docs
 
     @abstractmethod
diff --git a/server/knowledge_base/kb_service/faiss_kb_service.py b/server/knowledge_base/kb_service/faiss_kb_service.py
index 0ef820a..5c8376f 100644
--- a/server/knowledge_base/kb_service/faiss_kb_service.py
+++ b/server/knowledge_base/kb_service/faiss_kb_service.py
@@ -81,12 +81,13 @@ class FaissKBService(KBService):
     def do_search(self,
                   query: str,
                   top_k: int,
-                  embeddings: Embeddings,
+                  score_threshold: float = SCORE_THRESHOLD,
+                  embeddings: Embeddings = None,
                   ) -> List[Document]:
         search_index = load_vector_store(self.kb_name,
                                          embeddings=embeddings,
                                          tick=_VECTOR_STORE_TICKS.get(self.kb_name))
-        docs = search_index.similarity_search(query, k=top_k, score_threshold=SCORE_THRESHOLD)
+        docs = search_index.similarity_search_with_score(query, k=top_k, score_threshold=score_threshold)
         return docs
 
     def do_add_doc(self,
diff --git a/server/knowledge_base/kb_service/milvus_kb_service.py b/server/knowledge_base/kb_service/milvus_kb_service.py
index 6f1c392..f9c40c0 100644
--- a/server/knowledge_base/kb_service/milvus_kb_service.py
+++ b/server/knowledge_base/kb_service/milvus_kb_service.py
@@ -45,7 +45,8 @@ class MilvusKBService(KBService):
     def do_drop_kb(self):
         self.milvus.col.drop()
 
-    def do_search(self, query: str, top_k: int, embeddings: Embeddings) -> List[Document]:
+    def do_search(self, query: str, top_k: int, score_threshold: float, embeddings: Embeddings) -> List[Document]:
+        # todo: support score threshold
         self._load_milvus(embeddings=embeddings)
         return self.milvus.similarity_search(query, top_k, score_threshold=SCORE_THRESHOLD)
 
diff --git a/server/knowledge_base/kb_service/pg_kb_service.py b/server/knowledge_base/kb_service/pg_kb_service.py
index 82511bb..a3126ec 100644
--- a/server/knowledge_base/kb_service/pg_kb_service.py
+++ b/server/knowledge_base/kb_service/pg_kb_service.py
@@ -43,7 +43,8 @@ class PGKBService(KBService):
             '''))
             connect.commit()
 
-    def do_search(self, query: str, top_k: int, embeddings: Embeddings) -> List[Document]:
+    def do_search(self, query: str, top_k: int, score_threshold: float, embeddings: Embeddings) -> List[Document]:
+        # todo: support score threshold
         self._load_pg_vector(embeddings=embeddings)
         return self.pg_vector.similarity_search(query, top_k)
 
diff --git a/server/llm_api.py b/server/llm_api.py
index 0a7d3b0..e1013ed 100644
--- a/server/llm_api.py
+++ b/server/llm_api.py
@@ -4,6 +4,8 @@ import os
 
 sys.path.append(os.path.dirname(os.path.dirname(__file__)))
 from configs.model_config import llm_model_dict, LLM_MODEL, LLM_DEVICE, LOG_PATH, logger
+from server.utils import MakeFastAPIOffline
+
 
 host_ip = "0.0.0.0"
 controller_port = 20001
@@ -30,6 +32,8 @@ def create_controller_app(
     controller = Controller(dispatch_method)
     sys.modules["fastchat.serve.controller"].controller = controller
 
+    MakeFastAPIOffline(app)
+    app.title = "FastChat Controller"
     return app
 
 
@@ -55,7 +59,6 @@ def create_model_worker_app(
     import fastchat.constants
     fastchat.constants.LOGDIR = LOG_PATH
     from fastchat.serve.model_worker import app, GptqConfig, ModelWorker, worker_id
-    from fastchat.serve import model_worker
     import argparse
 
     parser = argparse.ArgumentParser()
@@ -117,6 +120,8 @@ def create_model_worker_app(
     sys.modules["fastchat.serve.model_worker"].args = args
     sys.modules["fastchat.serve.model_worker"].gptq_config = gptq_config
     
+    MakeFastAPIOffline(app)
+    app.title = f"FastChat LLM Server ({LLM_MODEL})"
     return app
 
 
@@ -141,6 +146,8 @@ def create_openai_api_app(
     app_settings.controller_address = controller_address
     app_settings.api_keys = api_keys
 
+    MakeFastAPIOffline(app)
+    app.title = "FastChat OpeanAI API Server"
     return app
 
 
diff --git a/server/static/favicon.png b/server/static/favicon.png
new file mode 100644
index 0000000..5de8ee8
Binary files /dev/null and b/server/static/favicon.png differ
diff --git a/server/utils.py b/server/utils.py
index e1a23d1..c0f11a5 100644
--- a/server/utils.py
+++ b/server/utils.py
@@ -2,14 +2,10 @@ import pydantic
 from pydantic import BaseModel
 from typing import List
 import torch
-from fastapi_offline import FastAPIOffline
-import fastapi_offline
+from fastapi import FastAPI
 from pathlib import Path
 import asyncio
-
-
-# patch fastapi_offline to use local static assests
-fastapi_offline.core._STATIC_PATH = Path(__file__).parent / "static"
+from typing import Any, Optional
 
 
 class BaseResponse(BaseModel):
@@ -112,3 +108,81 @@ def iter_over_async(ait, loop):
         if done:
             break
         yield obj
+
+
+def MakeFastAPIOffline(
+    app: FastAPI,
+    static_dir = Path(__file__).parent / "static",
+    static_url = "/static-offline-docs",
+    docs_url: Optional[str] = "/docs",
+    redoc_url: Optional[str] = "/redoc",
+) -> None:
+    """patch the FastAPI obj that doesn't rely on CDN for the documentation page"""
+    from fastapi import Request
+    from fastapi.openapi.docs import (
+        get_redoc_html,
+        get_swagger_ui_html,
+        get_swagger_ui_oauth2_redirect_html,
+    )
+    from fastapi.staticfiles import StaticFiles
+    from starlette.responses import HTMLResponse
+
+    openapi_url = app.openapi_url
+    swagger_ui_oauth2_redirect_url = app.swagger_ui_oauth2_redirect_url
+
+    def remove_route(url: str) -> None:
+        '''
+        remove original route from app
+        '''
+        index = None
+        for i, r in enumerate(app.routes):
+            if r.path.lower() == url.lower():
+                index = i
+                break
+        if isinstance(index, int):
+            app.routes.pop(i)
+
+    # Set up static file mount
+    app.mount(
+        static_url,
+        StaticFiles(directory=Path(static_dir).as_posix()),
+        name="static-offline-docs",
+    )
+
+    if docs_url is not None:
+        remove_route(docs_url)
+        remove_route(swagger_ui_oauth2_redirect_url)
+
+        # Define the doc and redoc pages, pointing at the right files
+        @app.get(docs_url, include_in_schema=False)
+        async def custom_swagger_ui_html(request: Request) -> HTMLResponse:
+            root = request.scope.get("root_path")
+            favicon = f"{root}{static_url}/favicon.png"
+            return get_swagger_ui_html(
+                openapi_url=f"{root}{openapi_url}",
+                title=app.title + " - Swagger UI",
+                oauth2_redirect_url=swagger_ui_oauth2_redirect_url,
+                swagger_js_url=f"{root}{static_url}/swagger-ui-bundle.js",
+                swagger_css_url=f"{root}{static_url}/swagger-ui.css",
+                swagger_favicon_url=favicon,
+            )
+
+        @app.get(swagger_ui_oauth2_redirect_url, include_in_schema=False)
+        async def swagger_ui_redirect() -> HTMLResponse:
+            return get_swagger_ui_oauth2_redirect_html()
+
+    if redoc_url is not None:
+        remove_route(redoc_url)
+
+        @app.get(redoc_url, include_in_schema=False)
+        async def redoc_html(request: Request) -> HTMLResponse:
+            root = request.scope.get("root_path")
+            favicon = f"{root}{static_url}/favicon.png"
+
+            return get_redoc_html(
+                openapi_url=f"{root}{openapi_url}",
+                title=app.title + " - ReDoc",
+                redoc_js_url=f"{root}{static_url}/redoc.standalone.js",
+                with_google_fonts=False,
+                redoc_favicon_url=favicon,
+            )
diff --git a/webui.py b/webui.py
index d84da42..99db3f6 100644
--- a/webui.py
+++ b/webui.py
@@ -13,7 +13,11 @@ import os
 api = ApiRequest(base_url="http://127.0.0.1:7861", no_remote_api=False)
 
 if __name__ == "__main__":
-    st.set_page_config("Langchain-Chatchat WebUI", initial_sidebar_state="expanded")
+    st.set_page_config(
+        "Langchain-Chatchat WebUI",
+        os.path.join("img", "chatchat_icon_blue_square_v2.png"),
+        initial_sidebar_state="expanded",
+    )
 
     if not chat_box.chat_inited:
         st.toast(
diff --git a/webui_pages/dialogue/dialogue.py b/webui_pages/dialogue/dialogue.py
index 89e148f..a317aba 100644
--- a/webui_pages/dialogue/dialogue.py
+++ b/webui_pages/dialogue/dialogue.py
@@ -76,7 +76,7 @@ def dialogue_page(api: ApiRequest):
                     key="selected_kb",
                 )
                 kb_top_k = st.number_input("匹配知识条数：", 1, 20, 3)
-                # score_threshold = st.slider("知识匹配分数阈值：", 0, 1, 0, disabled=True)
+                score_threshold = st.number_input("知识匹配分数阈值：", 0.0, 1.0, float(SCORE_THRESHOLD), 0.01)
                 # chunk_content = st.checkbox("关联上下文", False, disabled=True)
                 # chunk_size = st.slider("关联长度：", 0, 500, 250, disabled=True)
         elif dialogue_mode == "搜索引擎问答":
@@ -111,8 +111,8 @@ def dialogue_page(api: ApiRequest):
                 Markdown("...", in_expander=True, title="知识库匹配结果"),
             ])
             text = ""
-            for d in api.knowledge_base_chat(prompt, selected_kb, kb_top_k, history):
-                if error_msg := check_error_msg(t): # check whether error occured
+            for d in api.knowledge_base_chat(prompt, selected_kb, kb_top_k, score_threshold, history):
+                if error_msg := check_error_msg(d): # check whether error occured
                     st.error(error_msg)
                 text += d["answer"]
                 chat_box.update_msg(text, 0)
@@ -125,7 +125,7 @@ def dialogue_page(api: ApiRequest):
             ])
             text = ""
             for d in api.search_engine_chat(prompt, search_engine, se_top_k):
-                if error_msg := check_error_msg(t): # check whether error occured
+                if error_msg := check_error_msg(d): # check whether error occured
                     st.error(error_msg)
                 text += d["answer"]
                 chat_box.update_msg(text, 0)
diff --git a/webui_pages/utils.py b/webui_pages/utils.py
index b1d5c28..3e67ed7 100644
--- a/webui_pages/utils.py
+++ b/webui_pages/utils.py
@@ -6,6 +6,7 @@ from configs.model_config import (
     DEFAULT_VS_TYPE,
     KB_ROOT_PATH,
     LLM_MODEL,
+    SCORE_THRESHOLD,
     VECTOR_SEARCH_TOP_K,
     SEARCH_ENGINE_TOP_K,
     logger,
@@ -312,6 +313,7 @@ class ApiRequest:
         query: str,
         knowledge_base_name: str,
         top_k: int = VECTOR_SEARCH_TOP_K,
+        score_threshold: float = SCORE_THRESHOLD,
         history: List[Dict] = [],
         stream: bool = True,
         no_remote_api: bool = None,
@@ -326,6 +328,7 @@ class ApiRequest:
             "query": query,
             "knowledge_base_name": knowledge_base_name,
             "top_k": top_k,
+            "score_threshold": score_threshold,
             "history": history,
             "stream": stream,
             "local_doc_url": no_remote_api,