diff --git a/deploy/gpu_worker/gpu_worker.py b/deploy/gpu_worker/gpu_worker.py
index 8745597b7..72bb73aed 100644
--- a/deploy/gpu_worker/gpu_worker.py
+++ b/deploy/gpu_worker/gpu_worker.py
@@ -315,20 +315,20 @@ class TaskHeartbeat(threading.Thread):
         super().__init__(daemon=True, name=f"hb-{task_id[:8]}")
         self.task_id = task_id
         self.interval = max(5.0, interval)
-        self._stop = threading.Event()
+        self._stop_event = threading.Event()
 
     def run(self) -> None:
         # 先立即发一次，再按间隔循环（首次心跳失败不影响主流程）
-        while not self._stop.is_set():
+        while not self._stop_event.is_set():
             try:
                 if _register(self.task_id):
                     logger.debug("任务 %s 心跳已发送", self.task_id)
             except Exception as exc:  # noqa: BLE001
                 logger.warning("任务 %s 心跳异常（忽略）: %s", self.task_id, exc)
-            self._stop.wait(self.interval)
+            self._stop_event.wait(self.interval)
 
     def stop(self) -> None:
-        self._stop.set()
+        self._stop_event.set()
 
 
 def _handle_task(task: dict) -> None: