diff --git a/mock/index.js b/mock/index.js
index e14f94ed6c..59e82ed769 100644
--- a/mock/index.js
+++ b/mock/index.js
@@ -53,7 +53,7 @@ export function mockXHR() {
 // for mock server
 const responseFake = (url, type, respond) => {
   return {
-    url: new RegExp(`/mock${url}`),
+    url: new RegExp(`${url}`),
     type: type || 'get',
     response(req, res) {
       res.json(Mock.mock(respond instanceof Function ? respond(req, res) : respond))
diff --git a/mock/mock-server.js b/mock/mock-server.js
index 4c4cb2af83..60408f4313 100644
--- a/mock/mock-server.js
+++ b/mock/mock-server.js
@@ -2,15 +2,16 @@ const chokidar = require('chokidar')
 const bodyParser = require('body-parser')
 const chalk = require('chalk')
 const path = require('path')
+const express = require('express')
 
 const mockDir = path.join(process.cwd(), 'mock')
 
-function registerRoutes(app) {
+function registerRoutes(router) {
   let mockLastIndex
   const { default: mocks } = require('./index.js')
   for (const mock of mocks) {
-    app[mock.type](mock.url, mock.response)
-    mockLastIndex = app._router.stack.length
+    router[mock.type](mock.url, mock.response)
+    mockLastIndex = router.stack.length
   }
   const mockRoutesLength = Object.keys(mocks).length
   return {
@@ -30,17 +31,19 @@ function unregisterRoutes() {
 module.exports = app => {
   // es6 polyfill
   require('@babel/register')
+  const router = express.Router()
 
   // parse app.body
   // https://expressjs.com/en/4x/api.html#req.body
-  app.use(bodyParser.json())
-  app.use(bodyParser.urlencoded({
+  router.use(bodyParser.json())
+  router.use(bodyParser.urlencoded({
     extended: true
   }))
 
-  const mockRoutes = registerRoutes(app)
+  const mockRoutes = registerRoutes(router)
   var mockRoutesLength = mockRoutes.mockRoutesLength
   var mockStartIndex = mockRoutes.mockStartIndex
+  app.use(/^\/mock/, router)
 
   // watch files, hot reload mock server
   chokidar.watch(mockDir, {
@@ -50,12 +53,12 @@ module.exports = app => {
     if (event === 'change' || event === 'add') {
       try {
         // remove mock routes stack
-        app._router.stack.splice(mockStartIndex, mockRoutesLength)
+        router.stack.splice(mockStartIndex, mockRoutesLength)
 
         // clear routes cache
         unregisterRoutes()
 
-        const mockRoutes = registerRoutes(app)
+        const mockRoutes = registerRoutes(router)
         mockRoutesLength = mockRoutes.mockRoutesLength
         mockStartIndex = mockRoutes.mockStartIndex
 
diff --git a/vue.config.js b/vue.config.js
index 4244cfc8ac..d0931bb84a 100644
--- a/vue.config.js
+++ b/vue.config.js
@@ -47,7 +47,7 @@ module.exports = {
         }
       }
     },
-    after: require('./mock/mock-server.js')
+    before: require('./mock/mock-server.js')
   },
   configureWebpack: {
     // provide the app's title in webpack's name field, so that