diff --git a/packages/@vuepress/core/lib/app/Store.js b/packages/@vuepress/core/lib/app/Store.js
deleted file mode 100644
index cf3e5b60b9..0000000000
--- a/packages/@vuepress/core/lib/app/Store.js
+++ /dev/null
@@ -1,19 +0,0 @@
-import Vue from 'vue'
-
-export default class Store {
-  constructor () {
-    this.store = new Vue({
-      data: {
-        ob: {}
-      }
-    })
-  }
-
-  get (key) {
-    return this.store.ob[key]
-  }
-
-  set (key, value) {
-    Vue.set(this.store.ob, key, value)
-  }
-}
diff --git a/packages/@vuepress/core/lib/app/app.js b/packages/@vuepress/core/lib/app/app.js
index 272ca04262..2e7b1c864b 100644
--- a/packages/@vuepress/core/lib/app/app.js
+++ b/packages/@vuepress/core/lib/app/app.js
@@ -7,7 +7,7 @@ import { siteData } from '@internal/siteData'
 import appEnhancers from '@internal/app-enhancers'
 import globalUIComponents from '@internal/global-ui'
 import ClientComputedMixin from '@transform/ClientComputedMixin'
-import Store from './Store'
+import Store from './plugins/Store'
 
 // built-in components
 import Content from './components/Content'
@@ -30,9 +30,8 @@ if (module.hot) {
 
 Vue.config.productionTip = false
 
-Vue.$store = new Store()
-
 Vue.use(Router)
+Vue.use(Store, '$vuepress')
 // mixin for exposing $site and $page
 Vue.mixin(dataMixin(ClientComputedMixin, siteData))
 // component for rendering markdown content and setting title etc.
@@ -62,7 +61,7 @@ export function createApp (isServer) {
       if (saved) {
         return saved
       } else if (to.hash) {
-        if (Vue.$store.get('disableScrollBehavior')) {
+        if (Vue.$vuepress.$get('disableScrollBehavior')) {
           return false
         }
         return {
diff --git a/packages/@vuepress/core/lib/app/dataMixin.js b/packages/@vuepress/core/lib/app/dataMixin.js
index 1f0b2dfa18..7e0acc5a45 100644
--- a/packages/@vuepress/core/lib/app/dataMixin.js
+++ b/packages/@vuepress/core/lib/app/dataMixin.js
@@ -4,16 +4,16 @@ import Vue from 'vue'
 
 export default function dataMixin (I18n, siteData) {
   prepare(siteData)
-  Vue.$store.set('siteData', siteData)
+  Vue.$vuepress.$set('siteData', siteData)
 
   if (module.hot) {
     module.hot.accept(VUEPRESS_TEMP_PATH + '/internal/siteData.js', () => {
       prepare(siteData)
-      Vue.$store.set('siteData', siteData)
+      Vue.$vuepress.$set('siteData', siteData)
     })
   }
 
-  const I18nConstructor = I18n(Vue.$store.get('siteData'))
+  const I18nConstructor = I18n(Vue.$vuepress.$get('siteData'))
   const i18n = new I18nConstructor()
   const descriptors = Object.getOwnPropertyDescriptors(Object.getPrototypeOf(i18n))
   const computed = {}
diff --git a/packages/@vuepress/core/lib/app/plugins/Store.js b/packages/@vuepress/core/lib/app/plugins/Store.js
new file mode 100644
index 0000000000..ba84d258ab
--- /dev/null
+++ b/packages/@vuepress/core/lib/app/plugins/Store.js
@@ -0,0 +1,35 @@
+import Vue from 'vue'
+
+class Store {
+  constructor () {
+    this.store = new Vue({
+      data: {
+        state: {}
+      }
+    })
+  }
+
+  $get (key) {
+    return this.store.state[key]
+  }
+
+  $set (key, value) {
+    Vue.set(this.store.state, key, value)
+  }
+
+  $emit (...args) {
+    this.store.$emit(...args)
+  }
+
+  $on (...args) {
+    this.store.$on(...args)
+  }
+}
+
+export default {
+  install (Vue, options = '$store') {
+    const store = new Store()
+    Vue[options] = store
+    Vue.prototype[options] = store
+  }
+}