diff --git a/main.py b/main.py
index 2d3161c..e57c146 100644
--- a/main.py
+++ b/main.py
@@ -33,7 +33,7 @@ if not os.path.exists(inpDir):
 if not os.path.exists(tmpDir):
     os.mkdir(tmpDir)
 
-lock_simulation = asyncio.Lock()
+lock_simulation = False
 
 app = FastAPI()
 
@@ -150,18 +150,15 @@ async def fastapi_dump_inp(network: str, inp: str) -> bool:
 
 # 必须用这个PlainTextResponse，不然每个key都有引号
 @app.get("/runproject/", response_class = PlainTextResponse)
-async def fastapi_run_project(network: str) -> str:
+def fastapi_run_project(network: str) -> str:
 
-    if lock_simulation.locked():
+    if lock_simulation:
         raise HTTPException(status_code=409, detail="is in simulation")   
 
-    await lock_simulation.acquire()
-    
-    try:
-        result = run_project(network)
-        return result
-    finally:
-        lock_simulation.release()  # Release the lock
+    lock_simulation = True
+    result = run_project(network)
+    lock_simulation = False
+    return result
         
 # put in inp folder, name without extension
 @app.get("/runinp/")