diff --git a/server/api.py b/server/api.py
index eecd478..8a7a2c1 100644
--- a/server/api.py
+++ b/server/api.py
@@ -94,11 +94,11 @@ def create_app():
                summary="删除知识库内的文件"
                )(delete_doc)
 
-    # app.post("/knowledge_base/update_doc",
-    #          tags=["Knowledge Base Management"],
-    #          response_model=BaseResponse,
-    #          summary="上传文件到知识库，并删除另一个文件"
-    #          )(update_doc)
+    app.post("/knowledge_base/update_doc",
+             tags=["Knowledge Base Management"],
+             response_model=BaseResponse,
+             summary="更新现有文件到知识库"
+             )(update_doc)
 
     app.post("/knowledge_base/recreate_vector_store",
              tags=["Knowledge Base Management"],
diff --git a/server/knowledge_base/kb_doc_api.py b/server/knowledge_base/kb_doc_api.py
index 636e606..864662b 100644
--- a/server/knowledge_base/kb_doc_api.py
+++ b/server/knowledge_base/kb_doc_api.py
@@ -1,8 +1,8 @@
 import os
 import urllib
-from fastapi import File, Form, UploadFile
+from fastapi import File, Form, Body, UploadFile
 from server.utils import BaseResponse, ListResponse
-from server.knowledge_base.utils import (validate_kb_name)
+from server.knowledge_base.utils import (get_file_path, validate_kb_name)
 from fastapi.responses import StreamingResponse
 import json
 from server.knowledge_base.utils import KnowledgeFile, list_docs_from_folder
@@ -58,9 +58,10 @@ async def upload_doc(file: UploadFile = File(description="上传文件"),
     return BaseResponse(code=200, msg=f"成功上传文件 {kb_file.filename}")
 
 
-async def delete_doc(knowledge_base_name: str,
-                     doc_name: str,
-                     ):
+async def delete_doc(knowledge_base_name: str = Body(...),
+                     doc_name: str = Body(...),
+                     delete_content: bool = Body(...),
+                    ):
     if not validate_kb_name(knowledge_base_name):
         return BaseResponse(code=403, msg="Don't attack me")
 
@@ -73,14 +74,33 @@ async def delete_doc(knowledge_base_name: str,
         return BaseResponse(code=404, msg=f"未找到文件 {doc_name}")
     kb_file = KnowledgeFile(filename=doc_name,
                             knowledge_base_name=knowledge_base_name)
-    kb.delete_doc(kb_file)
+    kb.delete_doc(kb_file, delete_content)
     return BaseResponse(code=200, msg=f"{kb_file.filename} 文件删除成功")
     # return BaseResponse(code=500, msg=f"{kb_file.filename} 文件删除失败")
 
 
-async def update_doc():
-    # TODO: 替换文件
-    pass
+async def update_doc(
+        knowledge_base_name: str = Body(...),
+        file_name: str = Body(...),
+    ):
+    '''
+    更新知识库文档
+    '''
+    if not validate_kb_name(knowledge_base_name):
+        return BaseResponse(code=403, msg="Don't attack me")
+
+    kb = KBServiceFactory.get_service_by_name(knowledge_base_name)
+    if kb is None:
+        return BaseResponse(code=404, msg=f"未找到知识库 {knowledge_base_name}")
+
+    kb_file = KnowledgeFile(filename=file_name,
+                            knowledge_base_name=knowledge_base_name)
+
+    if os.path.exists(kb_file.filepath):
+        kb.update_doc(kb_file)
+        return BaseResponse(code=200, msg=f"成功更新文件 {kb_file.filename}")
+    else:
+        return BaseResponse(code=500, msg=f"{kb_file.filename} 文件上传失败，报错信息为: {e}")
 
 
 async def download_doc():
@@ -89,9 +109,9 @@ async def download_doc():
 
 
 async def recreate_vector_store(
-        knowledge_base_name: str,
-        allow_empty_kb: bool = True,
-        vs_type: str = "faiss",
+        knowledge_base_name: str = Body(...),
+        allow_empty_kb: bool = Body(True),
+        vs_type: str = Body("faiss"),
     ):
     '''
     recreate vector store from the content.
diff --git a/server/knowledge_base/kb_service/base.py b/server/knowledge_base/kb_service/base.py
index 5af47e7..8a675f3 100644
--- a/server/knowledge_base/kb_service/base.py
+++ b/server/knowledge_base/kb_service/base.py
@@ -65,21 +65,32 @@ class KBService(ABC):
         向知识库添加文件
         """
         docs = kb_file.file2text()
-        embeddings = self._load_embeddings()
-        self.do_add_doc(docs, embeddings)
-        status = add_doc_to_db(kb_file)
+        if docs:
+            embeddings = self._load_embeddings()
+            self.do_add_doc(docs, embeddings)
+            status = add_doc_to_db(kb_file)
+        else:
+            status = False
         return status
 
-    def delete_doc(self, kb_file: KnowledgeFile):
+    def delete_doc(self, kb_file: KnowledgeFile, delete_content: bool = False):
         """
         从知识库删除文件
         """
-        if os.path.exists(kb_file.filepath):
+        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)
         return status
 
+    def update_doc(self, kb_file: KnowledgeFile):
+        """
+        使用content中的文件更新向量库
+        """
+        if os.path.exists(kb_file.filepath):
+            self.delete_doc(kb_file)
+            return self.add_doc(kb_file)
+        
     def exist_doc(self, file_name: str):
         return doc_exists(KnowledgeFile(knowledge_base_name=self.kb_name,
                                         filename=file_name))
diff --git a/server/knowledge_base/kb_service/faiss_kb_service.py b/server/knowledge_base/kb_service/faiss_kb_service.py
index 064eb43..87eca2b 100644
--- a/server/knowledge_base/kb_service/faiss_kb_service.py
+++ b/server/knowledge_base/kb_service/faiss_kb_service.py
@@ -136,3 +136,13 @@ class FaissKBService(KBService):
     def do_clear_vs(self):
         shutil.rmtree(self.vs_path)
         os.makedirs(self.vs_path)
+
+    def exist_doc(self, file_name: str):
+        if super().exist_doc(file_name):
+            return "in_db"
+
+        content_path = os.path.join(self.kb_path, "content")
+        if os.path.isfile(os.path.join(content_path, file_name)):
+            return "in_folder"
+        else:
+            return False
diff --git a/server/knowledge_base/utils.py b/server/knowledge_base/utils.py
index 99f9472..5db5097 100644
--- a/server/knowledge_base/utils.py
+++ b/server/knowledge_base/utils.py
@@ -3,6 +3,7 @@ import os
 from langchain.embeddings.huggingface import HuggingFaceEmbeddings
 from configs.model_config import (embedding_model_dict, KB_ROOT_PATH, EMBEDDING_MODEL, kbs_config)
 from functools import lru_cache
+import langchain.document_loaders
 import sys
 
 
diff --git a/webui_pages/knowledge_base/knowledge_base.py b/webui_pages/knowledge_base/knowledge_base.py
index 83bedbd..d6399a8 100644
--- a/webui_pages/knowledge_base/knowledge_base.py
+++ b/webui_pages/knowledge_base/knowledge_base.py
@@ -88,7 +88,7 @@ def config_aggrid(
     gb = GridOptionsBuilder.from_dataframe(df)
     gb.configure_column("No", width=50)
     for k, v in titles.items():
-        gb.configure_column(k, v, maxWidth=100)
+        gb.configure_column(k, v, maxWidth=100, wrapHeaderText=True)
     gb.configure_selection(selection_mode, use_checkbox, pre_selected_rows=[0])
     return gb
 
@@ -149,7 +149,6 @@ def knowledge_base_page(api: ApiRequest):
                 files = st.file_uploader("上传知识文件",
                                         ["docx", "txt", "md", "csv", "xlsx", "pdf"],
                                         accept_multiple_files=True,
-                                        key="files",
                                         )
                 if st.button(
                     "添加文件到知识库",
@@ -199,7 +198,7 @@ def knowledge_base_page(api: ApiRequest):
             cols = st.columns(3)
             selected_rows = doc_grid.get("selected_rows", [])
 
-            cols = st.columns([2, 3, 2])
+            cols = st.columns(4)
             if selected_rows:
                 file_name = selected_rows[0]["file_name"]
                 file_path = get_file_path(kb, file_name)
@@ -207,9 +206,20 @@ def knowledge_base_page(api: ApiRequest):
                     cols[0].download_button("下载选中文档", fp, file_name=file_name)
             else:
                 cols[0].download_button("下载选中文档", "", disabled=True)
-            if cols[2].button("删除选中文档！", type="primary"):
+            
+            if cols[1].button("入库", disabled=len(selected_rows)==0):
                 for row in selected_rows:
-                    ret = api.delete_kb_doc(kb, row["file_name"])
+                    api.update_kb_doc(kb, row["file_name"])
+                st.experimental_rerun()
+
+            if cols[2].button("出库", disabled=len(selected_rows)==0):
+                for row in selected_rows:
+                    api.delete_kb_doc(kb, row["file_name"])
+                st.experimental_rerun()
+
+            if cols[3].button("删除选中文档！", type="primary"):
+                for row in selected_rows:
+                    ret = api.delete_kb_doc(kb, row["file_name"], True)
                     st.toast(ret["msg"])
                 st.experimental_rerun()
 
diff --git a/webui_pages/utils.py b/webui_pages/utils.py
index 10c905e..a273d8b 100644
--- a/webui_pages/utils.py
+++ b/webui_pages/utils.py
@@ -397,9 +397,11 @@ class ApiRequest:
         if no_remote_api is None:
             no_remote_api = self.no_remote_api
 
-        if isinstance(file, bytes):
+        if isinstance(file, bytes): # raw bytes
             file = BytesIO(file)
-        else:
+        elif hasattr(file, "read"): # a file io like object
+            filename = filename or file.name
+        else: # a local path
             file = Path(file).absolute().open("rb")
             filename = filename or file.name
 
@@ -410,6 +412,7 @@ class ApiRequest:
 
             temp_file = SpooledTemporaryFile(max_size=10 * 1024 * 1024)
             temp_file.write(file.read())
+            temp_file.seek(0)
             response = run_async(upload_doc(
                 UploadFile(temp_file, filename=filename),
                 knowledge_base_name,
@@ -428,6 +431,7 @@ class ApiRequest:
         self,
         knowledge_base_name: str,
         doc_name: str,
+        delete_content: bool = False,
         no_remote_api: bool = None,
     ):
         '''
@@ -438,11 +442,34 @@ class ApiRequest:
 
         if no_remote_api:
             from server.knowledge_base.kb_doc_api import delete_doc
-            response = run_async(delete_doc(knowledge_base_name, doc_name))
+            response = run_async(delete_doc(knowledge_base_name, doc_name, delete_content))
             return response.dict()
         else:
             response = self.delete(
                 "/knowledge_base/delete_doc",
+                json={"knowledge_base_name": knowledge_base_name, "doc_name": doc_name, "delete_content": delete_content},
+            )
+            return response.json()
+
+    def update_kb_doc(
+        self,
+        knowledge_base_name: str,
+        doc_name: str,
+        no_remote_api: bool = None,
+    ):
+        '''
+        对应api.py/knowledge_base/update_doc接口
+        '''
+        if no_remote_api is None:
+            no_remote_api = self.no_remote_api
+
+        if no_remote_api:
+            from server.knowledge_base.kb_doc_api import update_doc
+            response = run_async(update_doc(knowledge_base_name, doc_name))
+            return response.dict()
+        else:
+            response = self.delete(
+                "/knowledge_base/update_doc",
                 json={"knowledge_base_name": knowledge_base_name, "doc_name": doc_name},
             )
             return response.json()