diff --git a/start.py b/start.py
index 016152e..243eaa8 100644
--- a/start.py
+++ b/start.py
@@ -68,5 +68,6 @@ if __name__ == "__main__":
     atexit.register(stop_scheduler)
     DEBUG = os.environ.get("FLASK_DEBUG", "").lower() in ("1", "true", "yes")
     bind_host = os.environ.get("FLASK_BIND", "127.0.0.1")
-    app.run(host=bind_host, port=int(os.environ.get("FLASK_PORT", "5000")),
+    # 开发模式使用 5001，避免与生产 Gunicorn（0.0.0.0:5000）抢端口。
+    app.run(host=bind_host, port=int(os.environ.get("FLASK_PORT", "5001")),
             debug=DEBUG, threaded=True)