diff --git a/assets/index.less b/assets/index.less
index e799ee1..017301a 100644
--- a/assets/index.less
+++ b/assets/index.less
@@ -8,6 +8,8 @@
 @tooltip-arrow-width: 4px;
 @tooltip-distance: @tooltip-arrow-width+4;
 @tooltip-arrow-color: @tooltip-bg;
+@ease-out-quint      : cubic-bezier(0.23, 1, 0.32, 1);
+@ease-in-quint       : cubic-bezier(0.755, 0.05, 0.855, 0.06);
 
 * {
   box-sizing: border-box;
@@ -174,4 +176,64 @@
       border-top-color: @tooltip-arrow-color;
     }
   }
+}
+
+.motion-common() {
+  animation-duration: .3s;
+  animation-fill-mode: both;
+  display: block !important;
+}
+
+.make-motion(@className, @keyframeName) {
+  .@{className}-enter, .@{className}-appear {
+    .motion-common();
+    animation-play-state: paused;
+  }
+  .@{className}-leave {
+    .motion-common();
+    animation-play-state: paused;
+  }
+  .@{className}-enter.@{className}-enter-active, .@{className}-appear.@{className}-appear-active {
+    animation-name: ~"@{keyframeName}In";
+    animation-play-state: running;
+  }
+  .@{className}-leave.@{className}-leave-active {
+    animation-name: ~"@{keyframeName}Out";
+    animation-play-state: running;
+  }
+}
+.zoom-motion(@className, @keyframeName) {
+  .make-motion(@className, @keyframeName);
+  .@{className}-enter, .@{className}-appear {
+    transform: scale(0, 0); // need this by yiminghe
+    animation-timing-function: @ease-out-quint;
+  }
+  .@{className}-leave {
+    animation-timing-function: @ease-in-quint;
+  }
+}
+.zoom-motion(zoom-down, zoomDown);
+
+@keyframes zoomDownIn {
+  0% {
+    opacity: 0;
+    transform-origin: 50% 100%;
+    transform: scale(0, 0);
+  }
+  100% {
+    transform-origin: 50% 100%;
+    transform: scale(1, 1);
+  }
+}
+
+@keyframes zoomDownOut {
+  0% {
+    transform-origin: 50% 100%;
+    transform: scale(1, 1);
+  }
+  100% {
+    opacity: 0;
+    transform-origin: 50% 100%;
+    transform: scale(0, 0);
+  }
 }
\ No newline at end of file
diff --git a/package.json b/package.json
index 9535d52..49f34e1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rc-slider",
-  "version": "1.4.3",
+  "version": "1.4.4",
   "description": "slider ui component for react",
   "keywords": [
     "react",
@@ -24,7 +24,7 @@
   "licenses": "MIT",
   "main": "./lib/index.js",
   "config": {
-    "port": 8000
+    "port": 8005
   },
   "scripts": {
     "build": "rc-tools run build",
diff --git a/src/Slider.jsx b/src/Slider.jsx
index 0ca21dd..f13cfd7 100644
--- a/src/Slider.jsx
+++ b/src/Slider.jsx
@@ -56,6 +56,7 @@ const Slider = React.createClass({
     onBeforeChange: React.PropTypes.func,
     onChange: React.PropTypes.func,
     onAfterChange: React.PropTypes.func,
+    transitionName: React.PropTypes.string,
   },
 
   getDefaultProps() {
@@ -70,6 +71,7 @@ const Slider = React.createClass({
       prefixCls: 'rc-slider',
       disabled: false,
       defaultIndex: 0,
+      transitionName: 'zoom-down',
     };
   },
 
@@ -103,8 +105,14 @@ const Slider = React.createClass({
     }
   },
 
-  onMouseUp() {
-    this._end('mouse');
+  onMouseUp(e) {
+    const m = e.target;
+    const handleDom = React.findDOMNode(this.refs.handle);
+    let showToolTip = false;
+    if (m === handleDom) {
+      showToolTip = true;
+    }
+    this._end('mouse', showToolTip);
   },
 
   onTouchUp() {
@@ -308,8 +316,8 @@ const Slider = React.createClass({
 
     const handle = (<div className={className}
       {...events}
-                          ref="handle"
-                          style={onStyle}></div>);
+      ref="handle"
+      style={onStyle}></div>);
 
     if (this.props.marks.length > 0) {
       return handle;
@@ -320,6 +328,7 @@ const Slider = React.createClass({
         visible={tooltipVisible}
         overlay={<span>{this.state.value}</span>}
         delay={0}
+        transitionName={this.props.transitionName}
         prefixCls={prefixClsFn(prefixCls, 'tooltip')}>
         {handle}
       </Tooltip>
@@ -358,8 +367,8 @@ const Slider = React.createClass({
 
     return (
       <div className={rcUtil.classSet(sliderClassName)} ref="slider"
-           onTouchStart={disabled ? noop : this.onTouchStart}
-           onMouseDown={disabled ? noop : this.onSliderMouseDown}>
+        onTouchStart={disabled ? noop : this.onTouchStart}
+        onMouseDown={disabled ? noop : this.onSliderMouseDown}>
         {track}
         {ons}
         {steps}
@@ -468,12 +477,12 @@ const Slider = React.createClass({
     });
   },
 
-  _end(type) {
+  _end(type, showToolTip) {
     this._removeEventons(type);
     this._triggerEvents('onAfterChange');
     this.setState({
       dragging: false,
-      showTooltip: false,
+      showTooltip: !!showToolTip,
     });
   },
 });