diff --git a/src/main.js b/src/main.js
index ef07f3892fb..fb75857d37d 100644
--- a/src/main.js
+++ b/src/main.js
@@ -25,11 +25,12 @@ import * as filters from './filters' // global filters
  * you can execute: mockXHR()
  *
  * Currently MockJs will be used in the production environment,
- * please remove it before going online! ! !
+ * please remove it before going online ! ! !
  */
-import { mockXHR } from '../mock'
 if (process.env.NODE_ENV === 'production') {
-  mockXHR()
+  import('../mock').then(({ mockXHR }) => {
+    mockXHR()
+  })
 }
 
 Vue.use(Element, {