diff --git a/tests/pytest/util/dnodes.py b/tests/pytest/util/dnodes.py
index 80ab5baa9a..48dae22773 100644
--- a/tests/pytest/util/dnodes.py
+++ b/tests/pytest/util/dnodes.py
@@ -859,5 +859,15 @@ class TDDnodes:
     def getAsan(self):
         return self.asan
 
-
+global tdDnodes
 tdDnodes = TDDnodes()
+
+# global get
+def tdDnodes_Get():
+    global tdDnodes
+    return tdDnodes
+
+# global set
+def tdDnodes_Set(newInst):
+    global tdDnodes
+    tdDnodes = newInst
\ No newline at end of file
diff --git a/tests/system-test/test.py b/tests/system-test/test.py
index 7082bb0f22..1676aa04b6 100644
--- a/tests/system-test/test.py
+++ b/tests/system-test/test.py
@@ -385,6 +385,8 @@ if __name__ == "__main__":
             tdLog.debug("create an cluster  with %s nodes and make %s dnode as independent mnode"%(dnodeNums,mnodeNums))
             dnodeslist = cluster.configure_cluster(dnodeNums=dnodeNums, mnodeNums=mnodeNums, independentMnode=independentMnode)
             tdDnodes = ClusterDnodes(dnodeslist)
+            # set to global
+            tdDnodes_Set(tdDnodes)
             tdDnodes.init(deployPath, masterIp)
             tdDnodes.setTestCluster(testCluster)
             tdDnodes.setValgrind(valgrind)
@@ -555,6 +557,8 @@ if __name__ == "__main__":
             tdLog.debug("create an cluster  with %s nodes and make %s dnode as independent mnode"%(dnodeNums,mnodeNums))
             dnodeslist = cluster.configure_cluster(dnodeNums=dnodeNums, mnodeNums=mnodeNums, independentMnode=independentMnode)
             tdDnodes = ClusterDnodes(dnodeslist)
+            # set to global
+            tdDnodes_Set(tdDnodes)
             tdDnodes.init(deployPath, masterIp)
             tdDnodes.setTestCluster(testCluster)
             tdDnodes.setValgrind(valgrind)