diff --git a/tests/army/community/cluster/incSnapshot.py b/tests/army/community/cluster/incSnapshot.py
index 21f67b45fc..2095b6008b 100644
--- a/tests/army/community/cluster/incSnapshot.py
+++ b/tests/army/community/cluster/incSnapshot.py
@@ -68,7 +68,7 @@ class TDTestCase(TBase):
         clusterDnodes.starttaosd(1)
         clusterDnodes.starttaosd(2)
         clusterDnodes.starttaosd(3)
-
+        sql = "show vnodes;"
         time.sleep(10)
         while True:
             bFinish = True