diff --git a/tests/pytest/tools/taosdemoAllTest/taosdemoTestSupportNanosubscribe.py b/tests/pytest/tools/taosdemoAllTest/taosdemoTestSupportNanosubscribe.py
index da02f45fa1141a028cfc305bae9babb1856ccb40..de38ea9a96b0eb3c2339aff6933a7383bb82e368 100644
--- a/tests/pytest/tools/taosdemoAllTest/taosdemoTestSupportNanosubscribe.py
+++ b/tests/pytest/tools/taosdemoAllTest/taosdemoTestSupportNanosubscribe.py
@@ -80,6 +80,7 @@ class TDTestCase:
 
         # merge result files
         sleep(5)
+
         os.system("cat subscribe_res0.txt* > all_subscribe_res0.txt")
         os.system("cat subscribe_res1.txt* > all_subscribe_res1.txt")
         os.system("cat subscribe_res2.txt* > all_subscribe_res2.txt")