diff --git a/web/setting.py b/web/setting.py
index 9f0364288..460d57e9d 100755
--- a/web/setting.py
+++ b/web/setting.py
@@ -78,7 +78,7 @@ backlog = 512
 reload = False
 daemon = True
 # worker_class = 'geventwebsocket.gunicorn.workers.GeventWebSocketWorker'
-worker_class = 'sync'
+worker_class = 'gthread'
 timeout = 600
 keepalive = 60
 preload_app = True