diff --git a/dist/dialog/dialog.js b/dist/dialog/dialog.js
index 6148ab00..c47f1c32 100644
--- a/dist/dialog/dialog.js
+++ b/dist/dialog/dialog.js
@@ -24,8 +24,8 @@ Dialog.defaultOptions = {
   title: '',
   message: '',
   overlay: true,
+  asyncClose: false,
   selector: '#van-dialog',
-  beforeClose: null,
   confirmButtonText: '确认',
   cancelButtonText: '取消',
   showConfirmButton: true,
diff --git a/dist/dialog/index.js b/dist/dialog/index.js
index be129287..cda31a55 100644
--- a/dist/dialog/index.js
+++ b/dist/dialog/index.js
@@ -60,6 +60,10 @@ Component({
       this.handleAction('cancel');
     },
 
+    onClickOverlay() {
+      this.onClose('overlay');
+    },
+
     handleAction(action) {
       if (this.data.asyncClose) {
         this.setData({
diff --git a/dist/dialog/index.wxml b/dist/dialog/index.wxml
index 7176e4e3..09d6fead 100644
--- a/dist/dialog/index.wxml
+++ b/dist/dialog/index.wxml
@@ -1,4 +1,10 @@
-<van-popup show="{{ show }}" custom-class="van-dialog">
+<van-popup
+  show="{{ show }}"
+  overlay="{{ overlay }}"
+  close-on-click-overlay="{{ closeOnClickOverlay }}"
+  custom-class="van-dialog"
+  bind:close="onClickOverlay"
+>
   <view wx:if="{{ title }}" class="van-dialog__header {{ !message && !useSlot ? 'van-dialog--isolated' : '' }}">
     {{ title }}
   </view>
diff --git a/packages/dialog/README.md b/packages/dialog/README.md
index e69de29b..23e40c64 100644
--- a/packages/dialog/README.md
+++ b/packages/dialog/README.md
@@ -0,0 +1,160 @@
+## Dialog 弹出框
+
+Dialog 组件支持函数调用和组件调用两种形式
+
+### 使用指南
+
+在 index.json 中引入组件
+```json
+"usingComponents": {
+  "van-dialog": "path/to/vant-weapp/dist/dialog/index"
+}
+```
+
+### 代码演示
+
+#### 消息提示
+
+用于提示一些消息，只包含一个确认按钮
+
+```html
+<van-dialog id="van-dialog" />
+```
+
+```javascript
+import Dialog from 'path/to/vant-weapp/dist/dialog/dialog';
+
+Dialog.alert({
+  title: '标题',
+  message: '弹窗内容'
+}).then(() => {
+  // on close
+});
+
+Dialog.alert({
+  message: '弹窗内容'
+}).then(() => {
+  // on close
+});
+```
+
+#### 消息确认
+用于确认消息，包含取消和确认按钮
+
+```javascript
+Dialog.confirm({
+  title: '标题',
+  message: '弹窗内容'
+}).then(() => {
+  // on confirm
+}).catch(() => {
+  // on cancel
+});
+```
+
+#### 高级用法
+
+通过组件调用 Dialog 时，可以实现自定义弹窗内容、异步关闭等高级特性，具体可以参考下面的示例
+
+```html
+<van-dialog
+  use-slot
+  async-close
+  show="{{ show }}"
+  show-cancel-button
+  bind:close="onClose"
+>
+<van-field
+  value="{{ username }}"
+  label="用户名"
+  placeholder="请输入用户名"
+/>
+<van-field
+  value="{{ password }}"
+  type="password"
+  label="密码"
+  :border="false"
+  placeholder="请输入密码"
+/>
+</van-dialog>
+```
+
+```js
+Page({
+  data: {
+    show: true,
+    username: '',
+    password: ''
+  },
+
+  onClose(event) {
+    if (event.detail === 'confirm') {
+      // 异步关闭弹窗
+      setTimeout(() => {
+        this.setData({
+          show: false
+        });
+      }, 1000);
+    } else {
+      this.setData({
+        show: false
+      });
+    }
+  }
+});
+```
+
+
+### 方法
+
+| 方法名 | 参数 | 返回值 | 介绍 |
+|-----------|-----------|-----------|-------------|
+| Dialog | `options` | `Promise` | 展示弹窗 |
+| Dialog.alert | `options` | `Promise` | 展示消息提示弹窗 |
+| Dialog.confirm | `options` | `Promise` | 展示消息确认弹窗 |
+| Dialog.setDefaultOptions | `options` | `void` | 修改默认配置，对所有 Dialog 生效 |
+| Dialog.resetDefaultOptions | - | `void` | 重置默认配置，对所有 Dialog 生效 |
+| Dialog.close | - | `void` | 关闭弹窗 |
+
+### Options
+
+通过函数调用 Dialog 时，支持传入以下选项：
+
+| 参数 | 说明 | 类型 | 默认值 |
+|-----------|-----------|-----------|-------------|
+| title | 标题 | `String` | - |
+| message | 内容 | `String` | - |
+| selector | 自定义选择器 | `String` | `van-dialog` |
+| showConfirmButton | 是否展示确认按钮 | `Boolean` | `true` |
+| showCancelButton | 是否展示取消按钮 | `Boolean` | `false` |
+| confirmButtonText | 确认按钮的文案 | `String` | `确认` |
+| cancelButtonText | 取消按钮的文案 | `String` | `取消` |
+| overlay | 是否展示蒙层 | `Boolean` | `true` |
+| closeOnClickOverlay | 点击蒙层时是否关闭弹窗 | `Boolean` | `false` |
+| async-close | 是否异步关闭弹窗，开启后需要手动控制弹窗的关闭 | `Boolean` | `false` |
+
+### API
+
+通过组件调用 Dialog 时，支持以下 API：
+
+| 参数 | 说明 | 类型 | 默认值 |
+|-----------|-----------|-----------|-------------|
+| show | 是否显示弹窗 | `Boolean` | - |
+| title | 标题 | `String` | - |
+| message | 内容 | `String` | - |
+| show-confirm-button | 是否展示确认按钮 | `Boolean` |  `true` |
+| show-cancel-button | 是否展示取消按钮 | `Boolean` |  `false` |
+| confirm-button-text | 确认按钮的文案 | `String` |  `确认` |
+| cancel-button-text | 取消按钮的文案 | `String` | `取消` |
+| overlay | 是否展示蒙层 | `Boolean` | `true` |
+| close-on-click-overlay | 点击蒙层时是否关闭弹窗 | `Boolean` | `false` |
+| use-slot | 是否使用自定义内容的插槽 | `Boolean` | `false` |
+| async-close | 是否异步关闭弹窗，开启后需要手动控制弹窗的关闭 | `Boolean` | `false` |
+
+### Event
+
+| 事件 | 说明 | 回调参数 |
+|-----------|-----------|-----------|
+| bind:close | 弹窗关闭时触发 | event.detail: 触发关闭事件的来源，枚举为`confirm`,`cancel`,`overlay` |
+| bind:confirm | 点击确认按钮时触发 | - |
+| bind:cancel | 点击取消按钮时触发 | - |
diff --git a/packages/dialog/dialog.js b/packages/dialog/dialog.js
index 6148ab00..c47f1c32 100644
--- a/packages/dialog/dialog.js
+++ b/packages/dialog/dialog.js
@@ -24,8 +24,8 @@ Dialog.defaultOptions = {
   title: '',
   message: '',
   overlay: true,
+  asyncClose: false,
   selector: '#van-dialog',
-  beforeClose: null,
   confirmButtonText: '确认',
   cancelButtonText: '取消',
   showConfirmButton: true,
diff --git a/packages/dialog/index.js b/packages/dialog/index.js
index be129287..cda31a55 100644
--- a/packages/dialog/index.js
+++ b/packages/dialog/index.js
@@ -60,6 +60,10 @@ Component({
       this.handleAction('cancel');
     },
 
+    onClickOverlay() {
+      this.onClose('overlay');
+    },
+
     handleAction(action) {
       if (this.data.asyncClose) {
         this.setData({
diff --git a/packages/dialog/index.wxml b/packages/dialog/index.wxml
index 7176e4e3..09d6fead 100644
--- a/packages/dialog/index.wxml
+++ b/packages/dialog/index.wxml
@@ -1,4 +1,10 @@
-<van-popup show="{{ show }}" custom-class="van-dialog">
+<van-popup
+  show="{{ show }}"
+  overlay="{{ overlay }}"
+  close-on-click-overlay="{{ closeOnClickOverlay }}"
+  custom-class="van-dialog"
+  bind:close="onClickOverlay"
+>
   <view wx:if="{{ title }}" class="van-dialog__header {{ !message && !useSlot ? 'van-dialog--isolated' : '' }}">
     {{ title }}
   </view>