diff --git a/poco/drivers/android/uiautomation.py b/poco/drivers/android/uiautomation.py
index 404d263..b2f0039 100644
--- a/poco/drivers/android/uiautomation.py
+++ b/poco/drivers/android/uiautomation.py
@@ -200,6 +200,8 @@ def __init__(self, device=None, using_proxy=True, force_restart=False, use_airte
             if not ready:
                 raise RuntimeError("unable to launch AndroidUiautomationPoco")
         if ready:
+            if hasattr(self, '_keep_running_thread') and self._keep_running_thread.is_alive():
+                self._keep_running_thread.stop()
             # 首次启动成功后，在后台线程里监控这个进程的状态，保持让它不退出
             self._keep_running_thread = KeepRunningInstrumentationThread(self, p0)
             self._keep_running_thread.start()