diff --git a/components/cascader/index.jsx b/components/cascader/index.jsx
index 369fc104cd..775631031a 100644
--- a/components/cascader/index.jsx
+++ b/components/cascader/index.jsx
@@ -2,6 +2,7 @@ import React from 'react';
 import Cascader from 'rc-cascader';
 import Input from '../input';
 import arrayTreeFilter from 'array-tree-filter';
+import classNames from 'classnames';
 
 class AntCascader extends React.Component {
   constructor(props) {
@@ -25,12 +26,16 @@ class AntCascader extends React.Component {
     return displayRender(label);
   }
   render() {
-    const { prefixCls, children, placeholder, style } = this.props;
+    const { prefixCls, children, placeholder, style, size } = this.props;
+    const sizeCls = classNames({
+      'ant-input-lg': size === 'large',
+      'ant-input-sm': size === 'small',
+    });
     return (
       <Cascader {...this.props} onChange={this.handleChange}>
         {children ||
           <Input placeholder={placeholder}
-            className={`${prefixCls}-input ant-input`}
+            className={`${prefixCls}-input ant-input ${sizeCls}`}
             style={style}
             value={this.getLabel()}
             readOnly />}
@@ -48,6 +53,7 @@ AntCascader.defaultProps = {
   displayRender(label) {
     return label.join(' / ');
   },
+  size: 'default',
 };
 
 export default AntCascader;
diff --git a/components/cascader/index.md b/components/cascader/index.md
index 92c76c37cc..4d9ce58c3f 100644
--- a/components/cascader/index.md
+++ b/components/cascader/index.md
@@ -31,3 +31,4 @@
 | style | 自定义样式 | string | - |
 | popupClassName | 自定义浮层类名 | string | - |
 | placeholder | 输入框占位文本 | string | '请选择' |
+| size | 输入框大小，可选 `large` `default` `small` | string | `default` |