diff --git a/src/pages/processCenter/pages/creatProcess/qbrk/step5.vue b/src/pages/processCenter/pages/creatProcess/qbrk/step5.vue
index 74f23dccf..de81523ab 100644
--- a/src/pages/processCenter/pages/creatProcess/qbrk/step5.vue
+++ b/src/pages/processCenter/pages/creatProcess/qbrk/step5.vue
@@ -1456,6 +1456,7 @@
             },
             previewIframe(targetName, action){
                 let attId = targetName.name
+                this.iframeUrl = ""
                 this.previewShow(attId)
             },
             showDrawerClose () {