diff --git a/docs/changelog/roadmap.md b/docs/changelog/roadmap.md
index 90391679..41409af2 100644
--- a/docs/changelog/roadmap.md
+++ b/docs/changelog/roadmap.md
@@ -7,7 +7,6 @@
 
 ## Bugs
 
-- [ ] upload 接口会阻塞主进程
 - [ ] LightRAG 知识库查看不了解析后的文本，偶然出现，未复现
 
 ## Next
@@ -41,4 +40,5 @@
 - [x] 基于 create_agent 创建 SQL Viewer 智能体 <Badge type="info" text="0.3.5" />
 - [x] 优化 MCP 逻辑，支持 common + special 创建方式 <Badge type="info" text="0.3.5" />
 - [x] 修复本地知识库的 metadata 和 向量数据库中不一致的情况。
-- [x] v1 版本的 LangGraph 的工具渲染有问题
\ No newline at end of file
+- [x] v1 版本的 LangGraph 的工具渲染有问题
+- [x] upload 接口会阻塞主进程
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index efed6bc1..8982b121 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,6 +58,7 @@ dependencies = [
     "pypinyin>=0.55.0",
     "tomli",
     "tomli-w",
+    "aiofiles>=24.1.0",
 ]
 [tool.ruff]
 line-length = 120  # 代码最大行宽
diff --git a/server/routers/knowledge_router.py b/server/routers/knowledge_router.py
index ad4905d6..51f86221 100644
--- a/server/routers/knowledge_router.py
+++ b/server/routers/knowledge_router.py
@@ -1,3 +1,4 @@
+import aiofiles
 import asyncio
 import os
 import traceback
@@ -593,19 +594,26 @@ async def upload_file(
     basename, ext = os.path.splitext(file.filename)
     filename = f"{basename}_{hashstr(basename, 4, with_salt=True)}{ext}".lower()
     file_path = os.path.join(upload_dir, filename)
-    os.makedirs(upload_dir, exist_ok=True)
+
+    # 在线程池中执行同步文件系统操作，避免阻塞事件循环
+    await asyncio.to_thread(os.makedirs, upload_dir, exist_ok=True)
 
     file_bytes = await file.read()
 
-    content_hash = calculate_content_hash(file_bytes)
-    if knowledge_base.file_existed_in_db(db_id, content_hash):
+    # 在线程池中执行计算密集型操作，避免阻塞事件循环
+    content_hash = await asyncio.to_thread(calculate_content_hash, file_bytes)
+
+    # 在线程池中执行同步数据库查询，避免阻塞事件循环
+    file_exists = await asyncio.to_thread(knowledge_base.file_existed_in_db, db_id, content_hash)
+    if file_exists:
         raise HTTPException(
             status_code=409,
             detail="数据库中已经存在了相同文件，File with the same content already exists in this database",
         )
 
-    with open(file_path, "wb") as buffer:
-        buffer.write(file_bytes)
+    # 使用异步文件写入，避免阻塞事件循环
+    async with aiofiles.open(file_path, "wb") as buffer:
+        await buffer.write(file_bytes)
 
     return {
         "message": "File successfully uploaded",