diff --git a/main.py b/main.py
index c8e85ee..d4f1cc2 100644
--- a/main.py
+++ b/main.py
@@ -32,8 +32,7 @@ if not os.path.exists(tmpDir):
     os.mkdir(tmpDir)
 
 app = FastAPI()
-
-isSimulation = False
+app.state.is_simulation = False
 
 app.add_middleware(GZipMiddleware, minimum_size=1000)
 
@@ -149,10 +148,9 @@ 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:
-    global isSimulation
-    if not isSimulation:
+    if not app.state.is_simulation:
         result = run_project(network)
-        isSimulation = False
+        app.state.is_simulation = False
         return result
     else:
         raise HTTPException(status_code=400, detail="Is in Simulation")