diff --git a/handler/checker/check_task.py b/handler/checker/check_task.py
index f18acd90..97c4063e 100644
--- a/handler/checker/check_task.py
+++ b/handler/checker/check_task.py
@@ -63,15 +63,16 @@ def execute_one_node(self,steps_nu,node):
             self.stdio.verbose("run task in node: {0}".format(StringUtils.node_cut_passwd_for_log(node)))
             steps = self.task[steps_nu]
             nu = 1
+            task_variable_dict={}
             for step in steps["steps"]:
                 try:
                     self.stdio.verbose("step nu: {0}".format(nu))
                     if len(self.cluster) == 0:
                         raise Exception("cluster is not exist")
-                    step_run = StepBase(self.context, step, node, self.cluster, self.task_variable_dict)
+                    step_run = StepBase(self.context, step, node, self.cluster, task_variable_dict)
                     self.stdio.verbose("step nu: {0} initted, to execute".format(nu))
                     step_run.execute(self.report)
-                    self.task_variable_dict=step_run.update_task_variable_dict()
+                    task_variable_dict=step_run.update_task_variable_dict()
                     if "report_type" in step["result"] and step["result"]["report_type"] == "execution":
                         self.stdio.verbose("report_type stop this step")
                         return
diff --git a/handler/checker/step/stepbase.py b/handler/checker/step/stepbase.py
index 3ec68d8e..c3afe63c 100644
--- a/handler/checker/step/stepbase.py
+++ b/handler/checker/step/stepbase.py
@@ -33,7 +33,6 @@ def __init__(self, context, step, node, cluster, task_variable_dict):
         self.step = step
         self.node = node
         self.cluster = cluster
-        self.task_variable_dict = {}
         self.task_variable_dict = task_variable_dict
 
     def execute(self, report):