diff --git a/CHANGELOG.md b/CHANGELOG.md
index c85264d..ecd75cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # 变更日志
 
+## 0.2.0 / 2018-10-10
+
+- 将`extend`拆分为`extend`和`extendDeep`
+
 ## 0.1.0 / 2018-10-10
 
 - 新增 `assign()`
diff --git a/doc/api.md b/doc/api.md
index f17fcb6..37f537d 100644
--- a/doc/api.md
+++ b/doc/api.md
@@ -19,11 +19,15 @@ assign({}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
 ```
 
 ## extend
-将源对象属性进行浅拷贝或深拷贝，合并到目标对象，类似jQuery的`$.extend`
+将源对象属性进行浅拷贝，合并到目标对象，类似jQuery的`$.extend(false)`
+
+其实际为assign的别名
+
+## extendDeep
+将源对象属性进行深拷贝，合并到目标对象，类似jQuery的`$.extend(true)`
 
 函数参数和返回值（要遵守下面的例子的规则）
 
-- param {boolean} deep 是否进行递归赋值，如果为false或不传都为浅赋值，传true为深度递归赋值
 - param {object} target 目标对象
 - param {object} [...source] 源原对象
 - return {object} target对象
@@ -31,10 +35,7 @@ assign({}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
 举个例子（要包含代码用例）
 
 ```js
-// 浅赋值
-extend({}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
-extend(false, {}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
-
-// 深度递归赋值
-extend(true, {}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
+extendDeep({}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
+extendDeep(false, {}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
+extendDeep({}, {a: 1}, {a: 2, b: 1}) // {a: 2, b: 1}
 ```
diff --git a/package.json b/package.json
index d2b6532..ff71ab4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@jsmini/extend",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "最好用的js第三方库脚手架",
   "main": "dist/index.js",
   "jsnext:main": "dist/index.esm.js",
diff --git a/src/index.js b/src/index.js
index dc5549d..c4a01f4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -25,21 +25,11 @@ export const assign = isFunction(Object.assign) ? Object.assign : function assig
     return target;
 };
 
-export function extend(deep, target, ...sourceList) {
-    if (isObject(deep)) {
-        deep = false;
-        sourceList.unshift(target);
-        target = deep;
-    } else {
-        deep = !!deep;
-    }
-
-
-    // 浅拷贝
-    if (!deep) {
-        return assign(target, ...sourceList);
-    }
+export function extend(...args) {
+    return assign(...args);
+}
 
+export function extendDeep(target, ...sourceList) {
     // 深拷贝
     if (!isObject(target) && !isArray(target)) {
         throw new TypeError('extend target param must is object');
diff --git a/test/test.js b/test/test.js
index 94fa30a..1c9b680 100644
--- a/test/test.js
+++ b/test/test.js
@@ -2,6 +2,7 @@ var expect = require('expect.js');
 
 var assign = require('../dist/index.js').assign;
 var extend = require('../dist/index.js').extend;
+var extendDeep = require('../dist/index.js').extendDeep;
 
 describe('单元测试', function() {
     this.timeout(1000);
@@ -19,7 +20,7 @@ describe('单元测试', function() {
         });
     });
 
-    describe('extend:shallow', function() {
+    describe('extend', function() {
         it('常规', function() {
             // 缺省参数
             var h = extend({}, a, b);
@@ -27,19 +28,12 @@ describe('单元测试', function() {
             expect(h.a).to.equal(b.a);
             expect(h.b1).to.equal(b.b1);
             expect(h.b2).to.equal(b.b2);
-
-            // 显示参数
-            var h = extend(false, {}, a, b);
-
-            expect(h.a).to.equal(b.a);
-            expect(h.b1).to.equal(b.b1);
-            expect(h.b2).to.equal(b.b2);
         });
     });
 
-    describe('extend:deep', function() {
+    describe('extendDeep', function() {
         it('常规', function() {
-            var h = extend(true, {}, a, b);
+            var h = extendDeep({}, a, b);
 
             expect(h.a).to.equal(b.a);
             expect(h.b1).to.equal(b.b1);