diff --git a/components/form/demo/input-group.md b/components/form/demo/input-group.md
index 7a3ef42887..f71f7702cc 100644
--- a/components/form/demo/input-group.md
+++ b/components/form/demo/input-group.md
@@ -6,7 +6,7 @@ title: 输入框组合
 各类输入框的组合展现。
 
 ````jsx
-import { Form, Input, Select, Row, Col } from 'antd';
+import { Form, Input, Select, Col } from 'antd';
 const FormItem = Form.Item;
 const InputGroup = Input.Group;
 const Option = Select.Option;
@@ -68,27 +68,23 @@ ReactDOM.render(
       label="电话号码："
       labelCol={{ span: 6 }}
       wrapperCol={{ span: 16 }}>
-      <Row>
+      <InputGroup>
         <Col span="4">
           <Input id="tel1" defaultValue="086" />
         </Col>
         <Col span="2">
           <p className="ant-form-split">--</p>
         </Col>
-        <Col span="18">
-          <InputGroup>
-            <Col span="8">
-              <Input id="tel1" />
-            </Col>
-            <Col span="8">
-              <Input id="tel2" />
-            </Col>
-            <Col span="8">
-              <Input id="tel3" />
-            </Col>
-          </InputGroup>
+        <Col span="6">
+          <Input id="tel1" />
         </Col>
-      </Row>
+        <Col span="6">
+          <Input id="tel2" />
+        </Col>
+        <Col span="6">
+          <Input id="tel3" />
+        </Col>
+      </InputGroup>
     </FormItem>
   </Form>
 
diff --git a/components/form/index.md b/components/form/index.md
index 3d87be99c2..c043bb5a16 100644
--- a/components/form/index.md
+++ b/components/form/index.md
@@ -137,6 +137,10 @@ CustomizedForm = Form.create({})(CustomizedForm);
 
 #### Input.Group
 
+| 参数      | 说明                                     | 类型       |  可选值 | 默认值 |
+|-----------|------------------------------------------|------------|-------|--------|
+|  size | `Input.Group` 中所有的 `Input` 的大小 | string | {'large','default','small'} |  'default' |
+
 ```html
 <Input.Group className={string}>
   <Input />
diff --git a/components/form/style/index.less b/components/form/style/index.less
index 49d0f66285..5c33e4399b 100644
--- a/components/form/style/index.less
+++ b/components/form/style/index.less
@@ -122,12 +122,6 @@ form {
     }
   }
 
-  .ant-input,
-  .ant-input-group .ant-input,
-  .ant-input-group .ant-input-group-addon {
-    .input-lg();
-  }
-
   textarea.ant-input {
     height: auto;
   }
diff --git a/components/input/Group.jsx b/components/input/Group.jsx
index 8d01d9a962..871e9a8c8e 100644
--- a/components/input/Group.jsx
+++ b/components/input/Group.jsx
@@ -4,6 +4,8 @@ import classNames from 'classnames';
 export default function Group(props) {
   const className = classNames({
     'ant-input-group': true,
+    'ant-input-group-lg': props.size === 'large',
+    'ant-input-group-sm': props.size === 'small',
     [props.className]: !!props.className,
   });
   return (