diff --git a/docs/extensions/builtin/mip-iframe.md b/docs/extensions/builtin/mip-iframe.md
index 76f6f067..5c633be8 100755
--- a/docs/extensions/builtin/mip-iframe.md
+++ b/docs/extensions/builtin/mip-iframe.md
@@ -7,7 +7,7 @@
 标题|内容
 ----|----
 类型|通用
-支持布局|responsive, fixed-height, fixed
+支持布局|responsive, fixed-height, fixed, fill, container
 所需脚本|无
 
 ## 示例
@@ -59,63 +59,88 @@
 </mip-iframe>
 ```
 
+### 加 `encode` 转码中文字符
+
+```html
+<mip-iframe
+    allowfullscreen
+    srcdoc="
+        <div>你好</div>
+        "
+    encode
+    width="400"
+    height="300"
+    sandbox=""
+    allowtransparency="true">
+</mip-iframe>
+```
+
 ## 属性
 
 ### src
 
-说明：与原生 `<iframe>` 的 `src` 属性作用一致  
-必选项：是  
-类型：URL  
-单位：无  
-取值：必须要使用 HTTPS 地址  
+说明：与原生 `<iframe>` 的 `src` 属性作用一致
+必选项：是
+类型：URL
+单位：无
+取值：必须要使用 HTTPS 地址
 默认值：无
 
 ### width
 
 说明：宽度，不是实际宽度，与高度属性配合来设置图片比例，详见[组件布局](../../guide/component/layout.md)
-必选项：是  
-类型：数字  
-单位：无  
+必选项：是
+类型：数字
+单位：无
 默认值：无
 
 ### height
 
 说明：高度，不是实际高度，与宽度属性配合来设置图片比例，详见[组件布局](../../guide/component/layout.md)
-必选项：是  
-类型：数字  
-单位：无  
+必选项：是
+类型：数字
+单位：无
 默认值：无
 
 ### allowfullscreen
 
-说明：与原生 `<iframe>` 的 `allowfullscreen` 属性作用一致  
-必选项：否  
-取值：空  
+说明：与原生 `<iframe>` 的 `allowfullscreen` 属性作用一致
+必选项：否
+取值：空
 默认值：无
 
 ### srcdoc
 
-说明：与原生 `<iframe>` 的 `srcdoc` 属性作用一致	  
-必选项：否  
-类型：HTML_code  
-单位：无  
-取值：要显示在 `<iframe>` 中的 HTML 内容。必需是有效的 HTML 语法  
+说明：与原生 `<iframe>` 的 `srcdoc` 属性作用一致
+必选项：否
+类型：HTML_code
+单位：无
+取值：要显示在 `<iframe>` 中的 HTML 内容。必需是有效的 HTML 语法
 默认值：无
 
+### encode
+
+说明：是否对 `srcdoc` 的内容做 unicode 转 ascii，如果 srcdoc 存在中文等未做 ascii 转码的字符，需要设置该属性
+必选项：否
+类型：字符串
+单位：无
+取值："", true, false
+默认值：false
+
 ### sandbox
 
-说明：与原生 `<iframe>` 的 `sandbox` 属性作用一致  
-必选项：否  
-类型：字符串  	
-单位：无  
-取值："", `allow-same-origin`, `allow-top-navigation`, `allow-forms`, `allow-script`  
+说明：与原生 `<iframe>` 的 `sandbox` 属性作用一致
+必选项：否
+类型：字符串
+单位：无
+取值："", `allow-same-origin`, `allow-top-navigation`, `allow-forms`, `allow-script`
 默认值：无
 
 ### allowtransparency
 
-说明：与原生 `<iframe>` 的 `allowtransparency` 属性作用一致  
-必选项：否  
-类型：字符串  	
-单位：无  
-取值："", true, false  
+说明：与原生 `<iframe>` 的 `allowtransparency` 属性作用一致
+必选项：否
+类型：字符串
+单位：无
+取值："", true, false
 默认值：无
diff --git a/packages/mip/examples/builtin-components/mip-iframe.html b/packages/mip/examples/builtin-components/mip-iframe.html
index 99f49a7b..a285e62d 100644
--- a/packages/mip/examples/builtin-components/mip-iframe.html
+++ b/packages/mip/examples/builtin-components/mip-iframe.html
@@ -97,6 +97,32 @@ <h2>加 srcdoc</h2>
   allowtransparency="true">
 </mip-iframe>
 
+<h2>加带中文的 srcdoc</h2>
+
+<pre class="code">&lt;mip-iframe
+  allowfullscreen
+  srcdoc="
+    &lt;div&gt;你好&lt;/div&gt;
+    "
+  encode="true"
+  width="400"
+  height="300"
+  sandbox=""
+  allowtransparency="true"&gt;
+&lt;/mip-iframe&gt;</pre>
+
+<mip-iframe
+  allowfullscreen
+  srcdoc="
+    <div>你好</div>
+    "
+  encode
+  width="400"
+  height="300"
+  sandbox=""
+  allowtransparency="true">
+</mip-iframe>
+
 
 
 </body>
diff --git a/packages/mip/src/components/mip-iframe.js b/packages/mip/src/components/mip-iframe.js
index 607921d1..0dfa13d6 100755
--- a/packages/mip/src/components/mip-iframe.js
+++ b/packages/mip/src/components/mip-iframe.js
@@ -1,9 +1,11 @@
 /**
  * @file mip-iframe
  * @author zhangzhiqiang(zhiqiangzhang37@163.com)
+ *         clark-t (clarktanglei@163.com)
  */
 
 import util from '../util/index'
+import fn from '../util/fn'
 import CustomElement from '../custom-element'
 import viewport from '../viewport'
 import {
@@ -12,43 +14,107 @@ import {
   MESSAGE_PAGE_RESIZE
 } from '../page/const'
 
-let attrList = ['allowfullscreen', 'allowtransparency', 'sandbox']
+const ATTR_LIST = [
+  'allowfullscreen',
+  'allowtransparency',
+  'sandbox',
+  'referrerpolicy'
+]
+
+function encode (str) {
+  let arr
+  if (typeof window.TextEncoder !== 'undefined') {
+    arr = new window.TextEncoder('utf-8').encode(str)
+  } else {
+    arr = new Uint8Array(str.length)
+    str = unescape(encodeURIComponent(str))
+    for (let i = 0; i < str.length; i++) {
+      arr[i] = str.charCodeAt(i)
+    }
+  }
+  // 不能直接 arr.map().join()
+  let output = new Array(arr.length)
+  for (let i = 0; i < arr.length; i++) {
+    output[i] = String.fromCharCode(arr[i])
+  }
+  return output.join('')
+}
 
 class MipIframe extends CustomElement {
-  build () {
-    this.handlePageResize = this.handlePageResize.bind(this)
-    this.notifyRootPage = this.notifyRootPage.bind(this)
-    let element = this.element
-    let src = element.getAttribute('src')
-    let srcdoc = element.getAttribute('srcdoc')
-    if (srcdoc) {
-      src = 'data:text/html;charset=utf-8;base64,' + window.btoa(srcdoc)
+  constructor (...args) {
+    super(...args)
+
+    this._src = null
+    this.updateIframeSrc = fn.throttle(this.setIframeSrc.bind(this))
+  }
+
+  static get observedAttributes () {
+    return ['src', 'srcdoc']
+  }
+
+  attributeChangedCallback (name, oldValue, newValue) {
+    if (this.isBuilt) {
+      this[name] = newValue
+      this.updateIframeSrc()
     }
+  }
 
-    let height = element.getAttribute('height')
-    let width = element.getAttribute('width') || '100%'
+  set src (value) {
+    // 当 srcdoc 存在时，优先展示 srcdoc 的内容
+    if (this.element.getAttribute('srcdoc')) {
+      return
+    }
+    // url 必须是 https
+    if (value == null || value.slice(0, 8) === 'https://') {
+      this._src = value
+    } else {
+      this.srcdoc = `Invalid &lt;mip-iframe&gt; src. Must start with https://`
+    }
+  }
 
-    if (!src || !height) {
+  set srcdoc (value) {
+    // 当删除 srcdoc 属性时，显示 src 的内容
+    if (value == null) {
+      this.src = this.element.getAttribute('src')
+    } else if (this._srcdoc !== value) {
+      this._srcdoc = value
+      // 兼容 mip1
+      let needEncode = this.element.getAttribute('encode')
+      if (needEncode === 'true' || needEncode === '') {
+        value = encode(value)
+      }
+      this._src = 'data:text/html;charset=utf-8;base64,' + window.btoa(value)
+    }
+  }
+
+  setIframeSrc () {
+    if (!this._src) {
       return
     }
 
-    // window.addEventListener('message', )
-    window.addEventListener('message', this.notifyRootPage.bind(this))
+    if (this.iframe) {
+      if (this.iframe.src !== this._src) {
+        this.iframe.src = this._src
+      }
+      return
+    }
+
+    let height = this.element.getAttribute('height')
+    let width = this.element.getAttribute('width') || '100%'
 
     let iframe = document.createElement('iframe')
     iframe.frameBorder = '0'
     iframe.scrolling = util.platform.isIos() ? /* istanbul ignore next */ 'no' : 'yes'
+
     util.css(iframe, {
       width,
       height
     })
 
     this.applyFillContent(iframe)
-    iframe.src = src
-
-    this.expendAttr(attrList, iframe)
-    element.appendChild(iframe)
-
+    this.expendAttr(ATTR_LIST, iframe)
+    iframe.src = this._src
+    this.element.appendChild(iframe)
     this.iframe = iframe
 
     /**
@@ -70,13 +136,24 @@ class MipIframe extends CustomElement {
     }
   }
 
+  build () {
+    this.bindedHandlePageResize = this.handlePageResize.bind(this)
+    this.bindedNotifyRootPage = this.notifyRootPage.bind(this)
+
+    window.addEventListener('message', this.bindedNotifyRootPage)
+
+    this.srcdoc = this.element.getAttribute('srcdoc')
+    this.setIframeSrc()
+    this.isBuilt = true
+  }
+
   firstInviewCallback () {
-    window.addEventListener(CUSTOM_EVENT_RESIZE_PAGE, this.handlePageResize.bind(this))
+    window.addEventListener(CUSTOM_EVENT_RESIZE_PAGE, this.bindedHandlePageResize)
   }
 
   disconnectedCallback () {
-    window.removeEventListener(CUSTOM_EVENT_RESIZE_PAGE, this.handlePageResize.bind(this))
-    window.removeEventListener('message', this.notifyRootPage.bind(this))
+    window.removeEventListener(CUSTOM_EVENT_RESIZE_PAGE, this.bindedHandlePageResize)
+    window.removeEventListener('message', this.bindedNotifyRootPage)
   }
 
   notifyRootPage ({data}) {
diff --git a/packages/mip/test/specs/components/mip-iframe.spec.js b/packages/mip/test/specs/components/mip-iframe.spec.js
index a7e0f7fb..719d1ae2 100644
--- a/packages/mip/test/specs/components/mip-iframe.spec.js
+++ b/packages/mip/test/specs/components/mip-iframe.spec.js
@@ -13,11 +13,11 @@ import {
 
 import viewport from 'src/viewport'
 
-describe('mip-iframe', function () {
-  let mipIframe
-  let iframe
-
+describe.only('mip-iframe', function () {
   describe('iframe with default width and attrs', function () {
+    let mipIframe
+    let iframe
+
     this.timeout(1200)
     before(function () {
       mipIframe = document.createElement('mip-iframe')
@@ -50,6 +50,9 @@ describe('mip-iframe', function () {
   })
 
   describe('iframe with set width and height', function () {
+    let mipIframe
+    let iframe
+
     before(function () {
       mipIframe = document.createElement('mip-iframe')
       mipIframe.setAttribute('srcdoc', '<p>Hello MIP!</p>')
@@ -107,6 +110,9 @@ describe('mip-iframe', function () {
   })
 
   describe('iframe with no src and height', function () {
+    let mipIframe
+    let iframe
+
     before(function () {
       mipIframe = document.createElement('mip-iframe')
       document.body.appendChild(mipIframe)
@@ -121,4 +127,53 @@ describe('mip-iframe', function () {
       document.body.removeChild(mipIframe)
     })
   })
+
+  describe('iframe src is HTTP', function () {
+    let mipIframe
+    let iframe
+
+    before(function () {
+      mipIframe = document.createElement('mip-iframe')
+      mipIframe.setAttribute('width', '300px')
+      mipIframe.setAttribute('height', '400px')
+      mipIframe.setAttribute('layout', 'fixed')
+      mipIframe.setAttribute('src', 'http://www.baidu.com')
+      document.body.appendChild(mipIframe)
+    })
+
+    it('should alert HTTPS request', function () {
+      iframe = mipIframe.querySelector('iframe')
+      expect(iframe.src).to.equal('data:text/html;charset=utf-8;base64,' + window.btoa('Invalid &lt;mip-iframe&gt; src. Must start with https://'))
+    })
+
+    after(function () {
+      document.body.removeChild(mipIframe)
+    })
+  })
+
+
+  describe('iframe srcdoc with Chinese', function () {
+    this.timeout(1200)
+    let mipIframe
+
+    it('should show chinese words', function (done) {
+      expect(
+        function () {
+          mipIframe = document.createElement('mip-iframe')
+          mipIframe.setAttribute('width', '300px')
+          mipIframe.setAttribute('height', '400px')
+          mipIframe.setAttribute('layout', 'fixed')
+          mipIframe.setAttribute('srcdoc', '<p>你好</p>')
+          mipIframe.setAttribute('encode', 'true')
+          document.body.appendChild(mipIframe)
+
+          setTimeout(done, 1000)
+        }
+      ).to.not.throw()
+    })
+
+    after(function () {
+      document.body.removeChild(mipIframe)
+    })
+  })
 })