diff --git a/src/runtime/index.js b/src/runtime/index.js
index d35513d3d..f92756ffa 100644
--- a/src/runtime/index.js
+++ b/src/runtime/index.js
@@ -1,5 +1,7 @@
 import Vue from './instance/index'
+import { nextTick } from './util/index'
 
+Vue.nextTick = nextTick
 Vue.version = '2.0.0'
 
 export default Vue
diff --git a/src/runtime/instance/api.js b/src/runtime/instance/api.js
new file mode 100644
index 000000000..20dea88c2
--- /dev/null
+++ b/src/runtime/instance/api.js
@@ -0,0 +1,3 @@
+export function apiMixin (Vue) {
+
+}
diff --git a/src/runtime/instance/events.js b/src/runtime/instance/events.js
new file mode 100644
index 000000000..24884112c
--- /dev/null
+++ b/src/runtime/instance/events.js
@@ -0,0 +1,7 @@
+export function initEvents (vm) {
+
+}
+
+export function eventsMixin (Vue) {
+
+}
diff --git a/src/runtime/instance/index.js b/src/runtime/instance/index.js
index be823252e..6e5f7706c 100644
--- a/src/runtime/instance/index.js
+++ b/src/runtime/instance/index.js
@@ -1,41 +1,17 @@
-import Watcher from '../observer/watcher'
-import { h, patch } from '../vdom/index'
-import { nextTick, query } from '../util/index'
-import { initState, setData } from './state'
+import { initState, stateMixin } from './state'
+import { initRender, renderMixin } from './render'
+import { initEvents, eventsMixin } from './events'
+import { apiMixin } from './api'
 
 export default function Vue (options) {
   this.$options = options
   this._watchers = []
   initState(this)
-  this._el = query(options.el)
-  this._el.innerHTML = ''
-  this._watcher = new Watcher(this, options.render, this._update)
-  this._update(this._watcher.value)
+  initEvents(this)
+  initRender(this)
 }
 
-Vue.prototype._update = function (vtree) {
-  if (!this._tree) {
-    patch(this._el, vtree)
-  } else {
-    patch(this._tree, vtree)
-  }
-  this._tree = vtree
-}
-
-Vue.prototype.$forceUpdate = function () {
-  this._watcher.run()
-}
-
-Object.defineProperty(Vue.prototype, '$data', {
-  get () {
-    return this._data
-  },
-  set (newData) {
-    if (newData !== this._data) {
-      setData(this, newData)
-    }
-  }
-})
-
-Vue.prototype.__h__ = h
-Vue.nextTick = nextTick
+stateMixin(Vue)
+eventsMixin(Vue)
+renderMixin(Vue)
+apiMixin(Vue)
diff --git a/src/runtime/instance/init.js b/src/runtime/instance/init.js
deleted file mode 100644
index e69de29bb..000000000
diff --git a/src/runtime/instance/render.js b/src/runtime/instance/render.js
new file mode 100644
index 000000000..5ddba278c
--- /dev/null
+++ b/src/runtime/instance/render.js
@@ -0,0 +1,28 @@
+import Watcher from '../observer/watcher'
+import { query } from '../util/index'
+import { h, patch } from '../vdom/index'
+
+export function initRender (vm) {
+  const options = vm.$options
+  vm._el = query(options.el)
+  vm._el.innerHTML = ''
+  vm._watcher = new Watcher(vm, options.render, vm._update)
+  vm._update(vm._watcher.value)
+}
+
+export function renderMixin (Vue) {
+  Vue.prototype.__h__ = h
+
+  Vue.prototype._update = function (vtree) {
+    if (!this._tree) {
+      patch(this._el, vtree)
+    } else {
+      patch(this._tree, vtree)
+    }
+    this._tree = vtree
+  }
+
+  Vue.prototype.$forceUpdate = function () {
+    this._watcher.run()
+  }
+}
diff --git a/src/runtime/instance/state.js b/src/runtime/instance/state.js
index 7e0df51e7..db246ce26 100644
--- a/src/runtime/instance/state.js
+++ b/src/runtime/instance/state.js
@@ -112,7 +112,20 @@ function unproxy (vm, key) {
   }
 }
 
-export function setData (vm, newData) {
+export function stateMixin (Vue) {
+  Object.defineProperty(Vue.prototype, '$data', {
+    get () {
+      return this._data
+    },
+    set (newData) {
+      if (newData !== this._data) {
+        setData(this, newData)
+      }
+    }
+  })
+}
+
+function setData (vm, newData) {
   newData = newData || {}
   var oldData = vm._data
   vm._data = newData