diff --git a/README.md b/README.md
index 0b3b986e..41c3592b 100644
--- a/README.md
+++ b/README.md
@@ -143,10 +143,10 @@ React.render(<Cascader options={options} />, container);
       <td>callback when finishing cascader select</td>
     </tr>
     <tr>
-      <td>onSelect</td>
-      <td>Function(selectedOptions, done)</td>
+      <td>loadData</td>
+      <td>Function(selectedOptions)</td>
       <td></td>
-      <td>callback when click any option, argument "done" use for async select</td>
+      <td>callback when click any option, use for loading more options</td>
     </tr>
     <tr>
       <td>expandTrigger</td>
diff --git a/examples/dynamic-options.js b/examples/dynamic-options.js
index 24ff96ba..eea587f0 100644
--- a/examples/dynamic-options.js
+++ b/examples/dynamic-options.js
@@ -6,9 +6,11 @@ import ReactDOM from 'react-dom';
 
 const addressOptions = [{
   'label': '福建',
+  isLeaf: false,
   'value': 'fj',
 }, {
   'label': '浙江',
+  isLeaf: false,
   'value': 'zj',
 }];
 
@@ -19,39 +21,35 @@ const Demo = React.createClass({
       options: addressOptions,
     };
   },
-  onSelect(selectedOptions, done) {
-    const options = this.state.options;
-    const targetOption = selectedOptions[selectedOptions.length - 1];
-    if (selectedOptions.length === 1 && !targetOption.children) {
-      targetOption.label += ' loading';
-      // 动态加载下级数据
-      setTimeout(() => {
-        targetOption.label = targetOption.label.replace(' loading', '');
-        targetOption.children = [{
-          'label': targetOption.label + '动态加载1',
-          'value': 'dynamic1',
-        }, {
-          'label': targetOption.label + '动态加载2',
-          'value': 'dynamic2',
-        }];
-        this.setState({ options });
-        done();
-      }, 1000);
-      return;
-    }
-    done();
-  },
   onChange(value, selectedOptions) {
     this.setState({
       inputValue: selectedOptions.map(o => o.label).join(', '),
     });
   },
+  loadData(selectedOptions) {
+    const options = this.state.options;
+    const targetOption = selectedOptions[selectedOptions.length - 1];
+    targetOption.label += ' loading';
+    // 动态加载下级数据
+    setTimeout(() => {
+      targetOption.label = targetOption.label.replace(' loading', '');
+      targetOption.children = [{
+        'label': targetOption.label + '动态加载1',
+        'value': 'dynamic1',
+      }, {
+        'label': targetOption.label + '动态加载2',
+        'value': 'dynamic2',
+      }];
+      this.setState({options});
+    }, 1000);
+    this.setState({options});
+  },
   render() {
     return (
       <Cascader options={this.state.options}
-        onSelect={this.onSelect}
-        onChange={this.onChange}>
-        <input value={this.state.inputValue} readOnly />
+                loadData={this.loadData}
+                onChange={this.onChange}>
+        <input value={this.state.inputValue} readOnly/>
       </Cascader>
     );
   },
diff --git a/src/Cascader.jsx b/src/Cascader.jsx
index 2bbd800b..12f946f2 100644
--- a/src/Cascader.jsx
+++ b/src/Cascader.jsx
@@ -53,7 +53,7 @@ class Cascader extends React.Component {
   handleChange(options) {
     this.props.onChange(
       options.map(o => o.value),
-      options,
+      options
     );
     this.setPopupVisible(false);
   }
diff --git a/src/Menus.jsx b/src/Menus.jsx
index 8262ce28..f8bdad67 100644
--- a/src/Menus.jsx
+++ b/src/Menus.jsx
@@ -11,6 +11,7 @@ class Menus extends React.Component {
       value: initialValue,
     };
   }
+
   componentWillReceiveProps(nextProps) {
     if ('value' in nextProps) {
       this.setState({
@@ -18,17 +19,70 @@ class Menus extends React.Component {
       });
     }
     // sync activeValue with value when panel open
-    if (nextProps.visible) {
+    if (nextProps.visible && !this.props.visible) {
       this.setState({
         activeValue: this.state.value,
       });
     }
   }
+
+  onSelect(targetOption, menuIndex) {
+    if (!targetOption) {
+      return;
+    }
+    let activeValue = this.state.activeValue;
+    activeValue = activeValue.slice(0, menuIndex + 1);
+    activeValue[menuIndex] = targetOption.value;
+    const activeOptions = this.getActiveOptions(activeValue);
+    if (targetOption.isLeaf === false && !targetOption.children) {
+      if (this.props.loadData) {
+        this.setState({activeValue});
+        this.props.loadData(activeOptions);
+      }
+    } else if (!targetOption.children || !targetOption.children.length) {
+      this.props.onChange(activeOptions);
+      // finish select
+      // should set value to activeValue
+      this.setState({value: activeValue});
+    } else {
+      this.setState({activeValue});
+    }
+  }
+
+  getOption(option, menuIndex) {
+    const { prefixCls, expandTrigger } = this.props;
+    let menuItemCls = `${prefixCls}-menu-item`;
+    if (this.isActiveOption(option)) {
+      menuItemCls += ` ${prefixCls}-menu-item-active`;
+    }
+    const onSelect = this.onSelect.bind(this, option, menuIndex);
+    let expandProps = {
+      onClick: onSelect,
+    };
+    if (expandTrigger === 'hover' &&
+      option.children &&
+      option.children.length > 0) {
+      expandProps = {
+        onMouseEnter: onSelect,
+      };
+      menuItemCls += ` ${prefixCls}-menu-item-expand`;
+    }
+    return (
+      <li key={option.value}
+          className={menuItemCls}
+          title={option.label}
+        {...expandProps}>
+        {option.label}
+      </li>
+    );
+  }
+
   getActiveOptions(values) {
     const activeValue = values || this.state.activeValue;
     const options = this.props.options;
     return arrayTreeFilter(options, (o, level) => o.value === activeValue[level]);
   }
+
   getShowOptions() {
     const { options } = this.props;
     const result = this.getActiveOptions()
@@ -37,72 +91,24 @@ class Menus extends React.Component {
     result.unshift(options);
     return result;
   }
-  handleSelect(targetOption, menuIndex) {
-    if (!targetOption) {
-      return;
-    }
-    let activeValue = this.state.activeValue;
-    activeValue = activeValue.slice(0, menuIndex + 1);
-    activeValue[menuIndex] = targetOption.value;
-    const activeOptions = this.getActiveOptions(activeValue);
-    const selectCallback = () => {
-      if (!targetOption.children || targetOption.children.length === 0) {
-        this.props.onChange(activeOptions);
-        // finish select
-        // should set value to activeValue
-        this.setState({ value: activeValue });
-      }
-      this.forceUpdate();
-    };
-    // specify the last argument `done`:
-    //  onSelect(selectedOptions, done)
-    // it means async select
-    if (this.props.onSelect.length >= 2) {
-      this.props.onSelect(activeOptions, selectCallback);
-    } else {
-      this.props.onSelect(activeOptions);
-      selectCallback();
-    }
-    // set activeValue, waiting for async callback
-    this.setState({ activeValue });
-  }
+
   isActiveOption(option) {
     return this.state.activeValue.some(value => value === option.value);
   }
+
   render() {
-    const { prefixCls, expandTrigger } = this.props;
+    const { prefixCls } = this.props;
     return (
       <div>
         {this.getShowOptions().map((options, menuIndex) =>
-          <ul className={`${prefixCls}-menu`} key={menuIndex}>
-            {options.map(option => {
-              let menuItemCls = `${prefixCls}-menu-item`;
-              if (this.isActiveOption(option)) {
-                menuItemCls += ` ${prefixCls}-menu-item-active`;
-              }
-              const handleSelect = this.handleSelect.bind(this, option, menuIndex);
-              let expandProps = {
-                onClick: handleSelect,
-              };
-              if (expandTrigger === 'hover' &&
-                  option.children &&
-                  option.children.length > 0) {
-                expandProps = {
-                  onMouseEnter: handleSelect,
-                };
-                menuItemCls += ` ${prefixCls}-menu-item-expand`;
-              }
-              return (
-                <li key={option.value}
-                  className={menuItemCls}
-                  title={option.label}
-                  {...expandProps}>
-                  {option.label}
-                </li>
-              );
-            })}
-          </ul>
-        )}
+        <ul className={`${prefixCls}-menu`} key={menuIndex}>
+          {
+            options.map(option => {
+              return this.getOption(option, menuIndex);
+            })
+            }
+        </ul>
+          )}
       </div>
     );
   }
@@ -110,8 +116,10 @@ class Menus extends React.Component {
 
 Menus.defaultProps = {
   options: [],
-  onChange() {},
-  onSelect() {},
+  onChange() {
+  },
+  onSelect() {
+  },
   prefixCls: 'rc-cascader-menus',
   visible: false,
   expandTrigger: 'click',
@@ -122,7 +130,7 @@ Menus.propTypes = {
   prefixCls: React.PropTypes.string,
   expandTrigger: React.PropTypes.string,
   onChange: React.PropTypes.func,
-  onSelect: React.PropTypes.func,
+  loadData: React.PropTypes.func,
   visible: React.PropTypes.bool,
 };
 
diff --git a/tests/index.spec.js b/tests/index.spec.js
index 0f299cae..f9d9e420 100644
--- a/tests/index.spec.js
+++ b/tests/index.spec.js
@@ -71,9 +71,8 @@ describe('Cascader', () => {
     expect(selectedValue).not.to.be.ok();
 
     Simulate.click(menu3Items[0]);
-    expect(menu3Items[0].className).to.contain('rc-cascader-menu-item-active');
-    expect(selectedValue.join(',')).to.be('fj,fuzhou,mawei');
     expect(instance.state.popupVisible).not.to.be.ok();
+    expect(selectedValue.join(',')).to.be('fj,fuzhou,mawei');
     done();
   });
 
@@ -126,9 +125,8 @@ describe('Cascader', () => {
     expect(selectedValue).not.to.be.ok();
 
     Simulate.click(menu3Items[0]);
-    expect(menu3Items[0].className).to.contain('rc-cascader-menu-item-active');
-    expect(selectedValue.join(',')).to.be('fj,fuzhou,mawei');
     expect(instance.state.popupVisible).not.to.be.ok();
+    expect(selectedValue.join(',')).to.be('fj,fuzhou,mawei');
     done();
   });