diff --git a/dolphinscheduler-ui/src/js/conf/home/pages/dag/_source/dag.js b/dolphinscheduler-ui/src/js/conf/home/pages/dag/_source/dag.js
index ee17cf1a6c..937b7391ef 100644
--- a/dolphinscheduler-ui/src/js/conf/home/pages/dag/_source/dag.js
+++ b/dolphinscheduler-ui/src/js/conf/home/pages/dag/_source/dag.js
@@ -166,7 +166,6 @@ Dag.prototype.backfill = function (arg) {
       })
     })
   } else {
-    const self = this
     let plumbIns = jsPlumb.getInstance()
     plumbIns.reset()
     plumbIns.ready(() => {