diff --git a/README.md b/README.md
index 23b92232e3bf756231947134c75afa0ce1c09d5b..924053dc7cbc8be6d79778171062b0630e250fef 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ Wechaty is a Bot Framework for Wechat **Personal** Account which can help you cr
 # The World's Shortest ChatBot Code: 6 lines of JavaScript
 
 ```javascript
-const { Wechaty } = require('wechaty')
+const { Wechaty } = require('wechaty') // import Wechaty from 'wechaty'
 
 Wechaty.instance() // Singleton
 .on('scan', (url, code) => console.log(`Scan QR Code to login: ${code}\n${url}`))
diff --git a/bin/doctor.ts b/bin/doctor.ts
index 40180efd6a88d74b1ffdca8b05598bffcdb34ff7..e50d30cb6960d29d91872752c0e9ec43568d8607 100755
--- a/bin/doctor.ts
+++ b/bin/doctor.ts
@@ -9,12 +9,9 @@
 
 import * as os from 'os'
 
-import {
-  Config,
-}                   from '../src/config'
-import { Wechaty }  from '../src/wechaty'
-
-import { Doctor }   from '../src/doctor'
+import Config   from '../src/config'
+import Doctor   from '../src/doctor'
+import Wechaty  from '../src/wechaty'
 
 const wechaty = Wechaty.instance()
 const doctor = new Doctor()
diff --git a/bin/io-client.ts b/bin/io-client.ts
index ee201493aae36d73d0764916281c95d30c8be119..b83b635d6fdf2a6d70d94028d7820ead8a65d84c 100755
--- a/bin/io-client.ts
+++ b/bin/io-client.ts
@@ -10,9 +10,9 @@
 import {
   Config,
   log,
-}                   from '../src/config'
+}               from '../src/config'
 
-import { IoClient } from '../src/io-client'
+import IoClient from '../src/io-client'
 
 const welcome = `
 | __        __        _           _
diff --git a/bin/version.ts b/bin/version.ts
index 46838b6ac4835a147c13ad526eb3e02afad34752..be64c673f02c072ec3edf61855db568ea1d4f84a 100755
--- a/bin/version.ts
+++ b/bin/version.ts
@@ -7,7 +7,7 @@
  *
  */
 
-import { Wechaty } from '../src/wechaty'
+import Wechaty from '../src/wechaty'
 
 const w = Wechaty.instance()
 console.log(w.version())
diff --git a/src/config.ts b/src/config.ts
index e25123dcfddba8efc782e3382d6e65d7d475ca12..e940175799b36f336a4fe774a3211189c0354670 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -231,3 +231,5 @@ if (/verbose|silly/i.test(logLevel)) {
     })
   })
 }
+
+export default Config
diff --git a/src/doctor.ts b/src/doctor.ts
index 6634b2eeeb76868c01a6dd546efa5100a5198c3d..b156a75b52d4ee3c521da86e998e8b7d68a933dd 100644
--- a/src/doctor.ts
+++ b/src/doctor.ts
@@ -77,3 +77,5 @@ export class Doctor {
     })
   }
 }
+
+export default Doctor
diff --git a/src/io-client.ts b/src/io-client.ts
index 8d3cc5443c6c51bba59b43fd87b5960ceb02c47a..7a197122d898425b5cae3c6729dffa8848484097 100644
--- a/src/io-client.ts
+++ b/src/io-client.ts
@@ -269,3 +269,5 @@ export class IoClient {
 
   }
 }
+
+export default IoClient
diff --git a/src/io.ts b/src/io.ts
index eac46ce95d3cafe19809814c1f4172c22bfe5bb3..0f01455693e362ca941f1e8f955a5539b0d56d87 100644
--- a/src/io.ts
+++ b/src/io.ts
@@ -412,3 +412,5 @@ export class Io {
   }
 
 }
+
+export default Io
diff --git a/src/wechaty.ts b/src/wechaty.ts
index 0eba17875387363e1f46d3ced39857573f2b5d8a..ea8e43fbc4da0e36fced30cd33702923d85f9fbc 100644
--- a/src/wechaty.ts
+++ b/src/wechaty.ts
@@ -475,3 +475,5 @@ export class Wechaty extends EventEmitter implements Sayable {
                       })
   }
 }
+
+export default Wechaty