diff --git a/Example/testHotUpdate/src/index.js b/Example/testHotUpdate/src/index.js
index 3e1e896..42af99b 100644
--- a/Example/testHotUpdate/src/index.js
+++ b/Example/testHotUpdate/src/index.js
@@ -49,6 +49,10 @@ export default class App extends Component {
   };
 
   checkUpdate = () => {
+    if (__DEV__) {
+      // 开发模式不支持热更新，跳过检查
+      return;
+    }
     checkUpdate(appKey).then(info => {
       if (info.expired) {
         Alert.alert('提示', '您的应用版本已更新,请前往应用商店下载新的版本', [
@@ -63,7 +67,7 @@ export default class App extends Component {
         ]);
       }
     }).catch(err => {
-      Alert.alert('提示', '检查更新失败.');
+      console.warn(err);
     });
   };
 
diff --git a/docs/guide2.md b/docs/guide2.md
index 9a6a2f9..3bee1ba 100644
--- a/docs/guide2.md
+++ b/docs/guide2.md
@@ -87,7 +87,7 @@ import _updateConfig from './update.json';
 const {appKey} = _updateConfig[Platform.OS];
 
 class MyProject extends Component {
-  componentWillMount(){
+  componentDidMount(){
     if (isFirstTime) {
       Alert.alert('提示', '这是当前版本第一次启动,是否要模拟启动失败?失败将回滚到上一版本', [
         {text: '是', onPress: ()=>{throw new Error('模拟启动失败,请重启应用')}},
@@ -109,6 +109,10 @@ class MyProject extends Component {
     });
   };
   checkUpdate = () => {
+    if (__DEV__) {
+      // 开发模式不支持热更新，跳过检查
+      return;
+    }
     checkUpdate(appKey).then(info => {
       if (info.expired) {
         Alert.alert('提示', '您的应用版本已更新,请前往应用商店下载新的版本', [
@@ -123,7 +127,7 @@ class MyProject extends Component {
         ]);
       }
     }).catch(err => { 
-      Alert.alert('提示', '更新失败.');
+      console.warn(err);
     });
   };
   render() {
diff --git a/lib/index.js b/lib/index.js
index 970d59c..32faf76 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,11 +1,7 @@
-/**
- * Created by tdzl2003 on 4/4/16.
- */
+import { NativeAppEventEmitter, NativeModules } from 'react-native';
+const { HotUpdate } = NativeModules;
 
-const HotUpdate = require('react-native').NativeModules.HotUpdate;
-import {NativeAppEventEmitter} from 'react-native';
-
-let host = 'https://update.reactnative.cn/api';
+const host = 'https://update.reactnative.cn/api';
 
 export const downloadRootDir = HotUpdate.downloadRootDir;
 export const packageVersion = HotUpdate.packageVersion;
@@ -36,11 +32,20 @@ There is available update:
   diffUrl: 'http://update-packages.reactnative.cn/hash',
 }
  */
+
+function assertRelease() {
+  if (__DEV__) {
+    throw new Error('react-native-update can only run on RELEASE version.');
+  }
+}
+
+
 export async function checkUpdate(APPKEY) {
+  assertRelease();
   const resp = await fetch(`${host}/checkUpdate/${APPKEY}`, {
     method: 'POST',
     headers: {
-      'Accept': 'application/json',
+      Accept: 'application/json',
       'Content-Type': 'application/json',
     },
     body: JSON.stringify({
@@ -53,10 +58,11 @@ export async function checkUpdate(APPKEY) {
     throw new Error((await resp.json()).message);
   }
 
-  return await resp.json();
+  return resp.json();
 }
 
 export async function downloadUpdate(options) {
+  assertRelease();
   if (!options.update) {
     return;
   }
@@ -81,23 +87,21 @@ export async function downloadUpdate(options) {
   return options.hash;
 }
 
-export async function switchVersion(hash) {
-  HotUpdate.reloadUpdate({hashName:hash});
+export function switchVersion(hash) {
+  assertRelease();
+  HotUpdate.reloadUpdate({ hashName: hash });
 }
 
-export async function switchVersionLater(hash) {
-  HotUpdate.setNeedUpdate({hashName:hash});
+export function switchVersionLater(hash) {
+  assertRelease();
+  HotUpdate.setNeedUpdate({ hashName: hash });
 }
 
 export function markSuccess() {
+  assertRelease();
   HotUpdate.markSuccess();
 }
 
+NativeAppEventEmitter.addListener('RCTHotUpdateDownloadProgress', params => {});
 
-NativeAppEventEmitter.addListener('RCTHotUpdateDownloadProgress',(params)=>{
-
-})
-
-NativeAppEventEmitter.addListener('RCTHotUpdateUnzipProgress',(params)=>{
-
-})
\ No newline at end of file
+NativeAppEventEmitter.addListener('RCTHotUpdateUnzipProgress', params => {});