diff --git a/20.proxy.md b/20.proxy.md
new file mode 100644
index 0000000..fa1cf4f
--- /dev/null
+++ b/20.proxy.md
@@ -0,0 +1,42 @@
+# Proxy
+> 通过 Proxy 你可以改写对象的一些默认的方法，定义自己的逻辑。有一种保护，预处理的感觉
+```js
+const person = { name: 'Dp', age: 2000 };
+// `Proxy` 接收两个参数，第一个参数为要代理的目标对象，第二个参数是一个对象，包含我们要修改的方法
+const personProxy = new Proxy(person, {
+	// 改变获取值的方式
+	get(target, key) {
+		return target[key].toLowerCase();
+	},
+	// 改变设置值的方式
+	set(target, key, value) {
+		target[key] = value.toUpperCase();
+	}
+});
+```
+
+// 存取电话号码示例
+```js
+const phoneHandler = {
+	set(target, key, value) {
+		target[key] = value.match(/\d/g).join('');
+	},
+	get(target, key) {
+		return target[key].replace(/(\d{3})(\d{4})(\d{4})/, '$1-$2-$3');
+	}
+}
+const phoneProxy = new Proxy({}, phoneHandler);
+```
+打印结果
+```
+phoneProxy.home = '1350 8690 910'
+"1350 8690 910"
+phoneProxy.work = '18871233098'
+"18871233098"
+phoneProxy
+Proxy {home: "13508690910", work: "18871233098"}
+phoneProxy.home
+"135-0869-0910"
+phoneProxy.work
+"188-7123-3098"
+```
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diff --git a/README.MD b/README.MD
index 692b8ae..95a095c 100644
--- a/README.MD
+++ b/README.MD
@@ -20,4 +20,5 @@
 * [模块](https://github.com/dptms/es6/blob/master/16.modules.md)
 * [类](https://github.com/dptms/es6/blob/master/17.classes.md)
 * [遍历器 迭代器](https://github.com/dptms/es6/blob/master/18.iterator.md)
-* [生成器](https://github.com/dptms/es6/blob/master/19.generator.md)
\ No newline at end of file
+* [生成器](https://github.com/dptms/es6/blob/master/19.generator.md)
+* [Proxy](https://github.com/dptms/es6/blob/master/20.proxy.md)
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