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 e98cda22fd..66509a65ed 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
@@ -110,6 +110,7 @@ Dag.prototype.toolbarEvent = function ({ item, code, is }) {
  * Echo data display
  */
 Dag.prototype.backfill = function (arg) {
+  const that = this
   if (arg) {
     const marginX = 100
     const g = new dagre.graphlib.Graph()
@@ -144,7 +145,7 @@ Dag.prototype.backfill = function (arg) {
         instance: this.instance,
         options: {
           onRemoveNodes ($id) {
-            this.dag.removeEventModelById($id)
+            that.dag.removeEventModelById($id)
           }
         }
       })
@@ -167,7 +168,7 @@ Dag.prototype.backfill = function (arg) {
         instance: this.instance,
         options: {
           onRemoveNodes ($id) {
-            this.dag.removeEventModelById($id)
+            that.dag.removeEventModelById($id)
           }
         }
       })