diff --git a/components/_util/props-util.js b/components/_util/props-util.js
index 3872ccb86..9c95d149a 100644
--- a/components/_util/props-util.js
+++ b/components/_util/props-util.js
@@ -133,6 +133,7 @@ const getComponentFromProp = (instance, prop, options = instance, execute = true
     const componentOptions = instance.componentOptions || {};
     (componentOptions.children || []).forEach(child => {
       if (child.data && child.data.slot === prop) {
+        delete child.data.slot;
         if (child.tag === 'template') {
           slotsProp.push(child.children);
         } else {
diff --git a/components/progress/circle.jsx b/components/progress/circle.jsx
index 89db450ee..581bffe9f 100644
--- a/components/progress/circle.jsx
+++ b/components/progress/circle.jsx
@@ -1,6 +1,5 @@
 import { Circle as VCCircle } from '../vc-progress';
 import { validProgress } from './utils';
-import { ProgressProps } from './progress';
 
 const statusColorMap = {
   normal: '#108ee9',
diff --git a/components/progress/line.jsx b/components/progress/line.jsx
index 6d80d0f5f..bd5d0bd7c 100644
--- a/components/progress/line.jsx
+++ b/components/progress/line.jsx
@@ -1,5 +1,4 @@
 import { validProgress } from './utils';
-import { ProgressProps } from './progress';
 
 const Line = {
   functional: true,
diff --git a/components/radio/Group.jsx b/components/radio/Group.jsx
index 68faee769..371dbc40f 100644
--- a/components/radio/Group.jsx
+++ b/components/radio/Group.jsx
@@ -11,9 +11,7 @@ export default {
     prop: 'value',
   },
   props: {
-    prefixCls: {
-      type: String,
-    },
+    prefixCls: PropTypes.string,
     defaultValue: PropTypes.any,
     value: PropTypes.any,
     size: {
@@ -103,7 +101,6 @@ export default {
               prefixCls={prefixCls}
               disabled={props.disabled}
               value={option}
-              onChange={this.onRadioChange}
               checked={this.stateValue === option}
             >
               {option}
@@ -116,7 +113,6 @@ export default {
               prefixCls={prefixCls}
               disabled={option.disabled || props.disabled}
               value={option.value}
-              onChange={this.onRadioChange}
               checked={this.stateValue === option.value}
             >
               {option.label}
diff --git a/components/radio/Radio.jsx b/components/radio/Radio.jsx
index d229c483a..b8d8e838c 100644
--- a/components/radio/Radio.jsx
+++ b/components/radio/Radio.jsx
@@ -12,9 +12,7 @@ export default {
     prop: 'checked',
   },
   props: {
-    prefixCls: {
-      type: String,
-    },
+    prefixCls: PropTypes.string,
     defaultChecked: Boolean,
     checked: { type: Boolean, default: undefined },
     disabled: Boolean,
@@ -41,6 +39,12 @@ export default {
     blur() {
       this.$refs.vcCheckbox.blur();
     },
+    onChange(e) {
+      this.$emit('change', e);
+      if (this.radioGroupContext && this.radioGroupContext.onRadioChange) {
+        this.radioGroupContext.onRadioChange(e);
+      }
+    },
   },
 
   render() {
@@ -60,7 +64,7 @@ export default {
 
     if (radioGroup) {
       radioProps.props.name = radioGroup.name;
-      radioProps.on.change = radioGroup.onRadioChange;
+      radioProps.on.change = this.onChange;
       radioProps.props.checked = props.value === radioGroup.stateValue;
       radioProps.props.disabled = props.disabled || radioGroup.disabled;
     } else {
diff --git a/components/radio/RadioButton.jsx b/components/radio/RadioButton.jsx
index fefa0ce8d..2b4599a1a 100644
--- a/components/radio/RadioButton.jsx
+++ b/components/radio/RadioButton.jsx
@@ -1,4 +1,5 @@
 import Radio from './Radio';
+import PropTypes from '../_util/vue-types';
 import { getOptionProps } from '../_util/props-util';
 import { ConfigConsumerProps } from '../config-provider';
 
@@ -6,9 +7,6 @@ export default {
   name: 'ARadioButton',
   props: {
     ...Radio.props,
-    prefixCls: {
-      type: String,
-    },
   },
   inject: {
     radioGroupContext: { default: undefined },
diff --git a/components/radio/__tests__/group.test.js b/components/radio/__tests__/group.test.js
index 9cb4039a0..add89c5e5 100644
--- a/components/radio/__tests__/group.test.js
+++ b/components/radio/__tests__/group.test.js
@@ -2,6 +2,7 @@ import { mount } from '@vue/test-utils';
 import { asyncExpect } from '@/tests/utils';
 import Radio from '../Radio';
 import RadioGroup from '../Group';
+import RadioButton from '../radioButton';
 
 describe('Radio', () => {
   function createRadioGroup(props, listeners = {}) {
@@ -50,10 +51,16 @@ describe('Radio', () => {
       },
     });
 
-    wrapper.trigger('mouseenter');
+    wrapper
+      .findAll('div')
+      .at(0)
+      .trigger('mouseenter');
     expect(onMouseEnter).toHaveBeenCalled();
 
-    wrapper.trigger('mouseleave');
+    wrapper
+      .findAll('div')
+      .at(0)
+      .trigger('mouseleave');
     expect(onMouseLeave).toHaveBeenCalled();
   });
 
@@ -89,6 +96,80 @@ describe('Radio', () => {
     });
   });
 
+  it('both of radio and radioGroup will trigger onchange event when they exists', async () => {
+    const onChange = jest.fn();
+    const onChangeRadioGroup = jest.fn();
+
+    const wrapper = mount(
+      {
+        props: ['value'],
+        render() {
+          const groupProps = {};
+          if (this.value !== undefined) {
+            groupProps.value = this.value;
+          }
+          return (
+            <RadioGroup ref="radioGroup" {...groupProps} onChange={onChangeRadioGroup}>
+              <Radio value="A" onChange={onChange}>
+                A
+              </Radio>
+              <Radio value="B" onChange={onChange}>
+                B
+              </Radio>
+              <Radio value="C" onChange={onChange}>
+                C
+              </Radio>
+            </RadioGroup>
+          );
+        },
+      },
+      { sync: false },
+    );
+    const radios = wrapper.findAll('input');
+
+    // uncontrolled component
+    wrapper.vm.$refs.radioGroup.stateValue = 'B';
+    radios.at(0).trigger('change');
+    expect(onChange.mock.calls.length).toBe(1);
+    expect(onChangeRadioGroup.mock.calls.length).toBe(1);
+
+    // controlled component
+    wrapper.setProps({ value: 'A' });
+    radios.at(1).trigger('change');
+    expect(onChange.mock.calls.length).toBe(2);
+  });
+
+  it('Trigger onChange when both of radioButton and radioGroup exists', () => {
+    const onChange = jest.fn();
+    const props = {};
+    const wrapper = mount(
+      createRadioGroup(props, {
+        change: onChange,
+      }),
+      { sync: false },
+    );
+    const radios = wrapper.findAll('input');
+
+    // uncontrolled component
+    wrapper.vm.$refs.radioGroup.stateValue = 'B';
+    radios.at(0).trigger('change');
+    expect(onChange.mock.calls.length).toBe(1);
+
+    // controlled component
+    wrapper.setProps({ value: 'A' });
+    radios.at(1).trigger('change');
+    expect(onChange.mock.calls.length).toBe(2);
+  });
+
+  // it('should only trigger once when in group with options', () => {
+  //   const onChange = jest.fn();
+  //   const options = [{ label: 'Bamboo', value: 'Bamboo' }];
+  //   const wrapper = mount(<RadioGroup options={options} onChange={onChange} />);
+
+  //   wrapper.find('input').trigger('change');
+  //   expect(onChange).toHaveBeenCalledTimes(1);
+  // });
+
   // it('won\'t fire change events when value not changes', async () => {
   //   const onChange = jest.fn()
 
diff --git a/components/radio/__tests__/radio.test.js b/components/radio/__tests__/radio.test.js
index 09739fd6f..7141c3072 100644
--- a/components/radio/__tests__/radio.test.js
+++ b/components/radio/__tests__/radio.test.js
@@ -28,12 +28,12 @@ describe('Radio', () => {
       { sync: false },
     );
     await asyncExpect(() => {
-      wrapper.trigger('mouseenter');
+      wrapper.find('label').trigger('mouseenter');
     });
     await asyncExpect(() => {
       expect(onMouseEnter).toHaveBeenCalled();
     });
-    wrapper.trigger('mouseleave');
+    wrapper.find('label').trigger('mouseleave');
     await asyncExpect(() => {
       expect(onMouseLeave).toHaveBeenCalled();
     });
diff --git a/components/rate/index.jsx b/components/rate/index.jsx
index 60c1b070f..006acf993 100644
--- a/components/rate/index.jsx
+++ b/components/rate/index.jsx
@@ -40,12 +40,7 @@ const Rate = {
     characterRender(node, { index }) {
       const { tooltips } = this.$props;
       if (!tooltips) return node;
-      const tooltipsProps = {
-        props: {
-          title: tooltips[index],
-        },
-      };
-      return <Tooltip {...tooltipsProps}>{node}</Tooltip>;
+      return <Tooltip title={tooltips[index]}>{node}</Tooltip>;
     },
   },
   render() {
diff --git a/components/select/index.jsx b/components/select/index.jsx
index 36ed1013f..c5c687737 100644
--- a/components/select/index.jsx
+++ b/components/select/index.jsx
@@ -1,4 +1,4 @@
-import warning from 'warning';
+import warning from '../_util/warning';
 import omit from 'omit.js';
 import PropTypes from '../_util/vue-types';
 import { Select as VcSelect, Option, OptGroup } from '../vc-select';
@@ -96,7 +96,6 @@ const Select = {
   name: 'ASelect',
   props: {
     ...SelectProps,
-    prefixCls: PropTypes.string,
     showSearch: PropTypes.bool.def(false),
     transitionName: PropTypes.string.def('slide-up'),
     choiceTransitionName: PropTypes.string.def('zoom'),
diff --git a/components/skeleton/Title.jsx b/components/skeleton/Title.jsx
index 2bc922a44..2ffc7911d 100644
--- a/components/skeleton/Title.jsx
+++ b/components/skeleton/Title.jsx
@@ -1,5 +1,4 @@
 import PropTypes from '../_util/vue-types';
-import { initDefaultProps } from '../_util/props-util';
 
 const skeletonTitleProps = {
   prefixCls: PropTypes.string,
diff --git a/components/skeleton/demo/index.vue b/components/skeleton/demo/index.vue
index cc37b9e16..65c6d185f 100644
--- a/components/skeleton/demo/index.vue
+++ b/components/skeleton/demo/index.vue
@@ -16,8 +16,6 @@ const md = {
 
   - 网络较慢，需要长时间等待加载处理的情况下。
   - 图文信息内容较多的列表/卡片中。
-  - 只适合用在第一次加载数据的场景。
-  - 可以被 Spin 完全代替，但是在可用的场景下可以比 Spin 提供更好的视觉效果和用户体验。
             ## 代码演示`,
   us: `# Skeleton
 
@@ -27,8 +25,6 @@ const md = {
 
   - When resource needs long time to load, like low network speed.
   - The component contains much information. Such as List or Card.
-  - Only works when loading data at first time.
-  - Could be replaced by Spin in all situation, but provide better user experience then spin if it works.
   ## Examples
   `,
 };
@@ -38,12 +34,12 @@ export default {
   type: 'Feedback',
   title: 'Skeleton',
   cols: 1,
-  render () {
+  render() {
     return (
       <div>
-        <md cn={md.cn} us={md.us}/>
-        <br/>
-        <Basic/>
+        <md cn={md.cn} us={md.us} />
+        <br />
+        <Basic />
         <br />
         <Complex />
         <br />
@@ -52,12 +48,12 @@ export default {
         <Children />
         <br />
         <List />
-        <br/>
+        <br />
         <api>
-          <template slot='cn'>
-            <CN/>
+          <template slot="cn">
+            <CN />
           </template>
-          <US/>
+          <US />
         </api>
       </div>
     );
diff --git a/components/slider/index.en-US.md b/components/slider/index.en-US.md
index a91e60aa5..8ec5ce03b 100644
--- a/components/slider/index.en-US.md
+++ b/components/slider/index.en-US.md
@@ -3,11 +3,11 @@
 | Property | Description | Type | Default |
 | -------- | ----------- | ---- | ------- |
 | autoFocus | get focus when component mounted | boolean | false |
-| defaultValue | The default value of slider. When `range` is `false`, use `number`, otherwise, use `[number, number]` | number\|number\[] | 0 or [0, 0] |
+| defaultValue | The default value of slider. When `range` is `false`, use `number`, otherwise, use `[number, number]` | number\|number\[] | 0 or \[0, 0] |
 | disabled | If true, the slider will not be interactable. | boolean | false |
 | dots | Whether the thumb can drag over tick only. | boolean | false |
 | included | Make effect when `marks` not null，`true` means containment and `false` means coordinative | boolean | true |
-| marks | Tick mark of Slider, type of key must be `number`, and must in closed interval [min, max] ，each mark can declare its own style. | object | { number: string\|VNode } or { number: { style: object, label: string\|VNode } }  or { number: () => VNode } |
+| marks | Tick mark of Slider, type of key must be `number`, and must in closed interval \[min, max], each mark can declare its own style. | object | { number: string\|VNode } or { number: { style: object, label: string\|VNode } }  or { number: () => VNode } |
 | max | The maximum value the slider can slide to | number | 100 |
 | min | The minimum value the slider can slide to. | number | 0 |
 | range | dual thumb mode | boolean | false |
diff --git a/components/slider/index.jsx b/components/slider/index.jsx
index 8c56e9aeb..fcbafa16d 100644
--- a/components/slider/index.jsx
+++ b/components/slider/index.jsx
@@ -6,6 +6,7 @@ import VcRange from '../vc-slider/src/Range';
 import VcHandle from '../vc-slider/src/Handle';
 import Tooltip from '../tooltip';
 import Base from '../base';
+import { ConfigConsumerProps } from '../config-provider';
 
 // export interface SliderMarks {
 //   [key]: React.ReactNode | {
@@ -43,10 +44,11 @@ const Slider = {
     event: 'change',
   },
   mixins: [BaseMixin],
+  inject: {
+    configProvider: { default: () => ConfigConsumerProps },
+  },
   props: {
     ...SliderProps(),
-    prefixCls: PropTypes.string.def('ant-slider'),
-    tooltipPrefixCls: PropTypes.string.def('ant-tooltip'),
     tipFormatter: PropTypes.oneOfType([PropTypes.func, PropTypes.object]).def(value =>
       value.toString(),
     ),
@@ -65,8 +67,8 @@ const Slider = {
         },
       }));
     },
-    handleWithTooltip({ value, dragging, index, directives, on, ...restProps }) {
-      const { tooltipPrefixCls, tipFormatter, tooltipVisible } = this.$props;
+    handleWithTooltip(tooltipPrefixCls, { value, dragging, index, directives, on, ...restProps }) {
+      const { tipFormatter, tooltipVisible } = this.$props;
       const { visibles } = this;
       const isTipFormatter = tipFormatter ? visibles[index] || dragging : false;
       const visible = tooltipVisible || (tooltipVisible === undefined && isTipFormatter);
@@ -106,12 +108,22 @@ const Slider = {
     },
   },
   render() {
-    const { range, ...restProps } = getOptionProps(this);
+    const {
+      range,
+      prefixCls: customizePrefixCls,
+      tooltipPrefixCls: customizeTooltipPrefixCls,
+      ...restProps
+    } = getOptionProps(this);
+    const getPrefixCls = this.configProvider.getPrefixCls;
+    const prefixCls = getPrefixCls('skeleton', customizePrefixCls);
+    const tooltipPrefixCls = getPrefixCls('skeleton', customizeTooltipPrefixCls);
     if (range) {
       const vcRangeProps = {
         props: {
           ...restProps,
-          handle: this.handleWithTooltip,
+          prefixCls,
+          tooltipPrefixCls,
+          handle: info => this.handleWithTooltip(tooltipPrefixCls, info),
         },
         ref: 'sliderRef',
         on: this.$listeners,
@@ -121,7 +133,9 @@ const Slider = {
     const vcSliderProps = {
       props: {
         ...restProps,
-        handle: this.handleWithTooltip,
+        prefixCls,
+        tooltipPrefixCls,
+        handle: info => this.handleWithTooltip(tooltipPrefixCls, info),
       },
       ref: 'sliderRef',
       on: this.$listeners,
diff --git a/components/slider/index.zh-CN.md b/components/slider/index.zh-CN.md
index 44a69b026..b53878afa 100644
--- a/components/slider/index.zh-CN.md
+++ b/components/slider/index.zh-CN.md
@@ -3,11 +3,11 @@
 | 参数 | 说明 | 类型 | 默认值 |
 | --- | --- | --- | --- |
 | autoFocus | 自动获取焦点 | boolean | false |
-| defaultValue | 设置初始取值。当 `range` 为 `false` 时，使用 `number`，否则用 `[number, number]` | number\|number\[] | 0 or [0, 0] |
+| defaultValue | 设置初始取值。当 `range` 为 `false` 时，使用 `number`，否则用 `[number, number]` | number\|number\[] | 0 or \[0, 0] |
 | disabled | 值为 `true` 时，滑块为禁用状态 | boolean | false |
 | dots | 是否只能拖拽到刻度上 | boolean | false |
 | included | `marks` 不为空对象时有效，值为 true 时表示值为包含关系，false 表示并列 | boolean | true |
-| marks | 刻度标记，key 的类型必须为 `number` 且取值在闭区间 [min, max] 内，每个标签可以单独设置样式 | object | { number: string\|VNode } or { number: { style: object, label: string\|VNode } } or { number: () => VNode } |
+| marks | 刻度标记，key 的类型必须为 `number` 且取值在闭区间 \[min, max] 内，每个标签可以单独设置样式 | object | { number: string\|VNode } or { number: { style: object, label: string\|VNode } } or { number: () => VNode } |
 | max | 最大值 | number | 100 |
 | min | 最小值 | number | 0 |
 | range | 双滑块模式 | boolean | false |
diff --git a/components/spin/Spin.jsx b/components/spin/Spin.jsx
index ee0cebd53..c4f095d70 100644
--- a/components/spin/Spin.jsx
+++ b/components/spin/Spin.jsx
@@ -51,10 +51,11 @@ export default {
   },
   data() {
     const { spinning, delay } = this;
+    const shouldBeDelayed = shouldDelay(spinning, delay);
     this.originalUpdateSpinning = this.updateSpinning;
     this.debouncifyUpdateSpinning(this.$props);
     return {
-      sSpinning: spinning && !shouldDelay(spinning, delay),
+      sSpinning: spinning && !shouldBeDelayed,
     };
   },
   mounted() {
diff --git a/components/spin/__tests__/delay.test.js b/components/spin/__tests__/delay.test.js
new file mode 100644
index 000000000..b838df87b
--- /dev/null
+++ b/components/spin/__tests__/delay.test.js
@@ -0,0 +1,69 @@
+import { mount } from '@vue/test-utils';
+import { asyncExpect } from '@/tests/utils';
+import Spin from '..';
+
+describe('delay spinning', () => {
+  it("should render with delay when it's mounted with spinning=true and delay", async () => {
+    const props = {
+      propsData: {
+        delay: 500,
+        spinning: true,
+      },
+      sync: false,
+    };
+    const wrapper = mount(Spin, props);
+    await asyncExpect(() => {
+      expect(
+        wrapper
+          .find('.ant-spin')
+          .classes()
+          .includes('ant-spin-spinning'),
+      ).toEqual(false);
+    });
+  });
+
+  it('should render when delay is init set', async () => {
+    const props = {
+      propsData: {
+        delay: 100,
+        spinning: true,
+      },
+      sync: false,
+    };
+    const wrapper = mount(Spin, props);
+
+    expect(
+      wrapper
+        .findAll('.ant-spin')
+        .at(0)
+        .classes()
+        .includes('ant-spin-spinning'),
+    ).toEqual(false);
+
+    // use await not jest.runAllTimers()
+    // because of https://github.com/facebook/jest/issues/3465
+    await new Promise(resolve => setTimeout(resolve, 500));
+
+    expect(
+      wrapper
+        .findAll('.ant-spin')
+        .at(0)
+        .classes()
+        .includes('ant-spin-spinning'),
+    ).toEqual(true);
+  });
+
+  it('should cancel debounce function when unmount', async () => {
+    const props = {
+      propsData: {
+        delay: 100,
+        spinning: true,
+      },
+      sync: false,
+    };
+    const wrapper = mount(Spin, props);
+    const spy = jest.spyOn(wrapper.vm.updateSpinning, 'cancel');
+    expect(wrapper.vm.updateSpinning.cancel).toEqual(expect.any(Function));
+    expect(spy).not.toHaveBeenCalled();
+  });
+});
diff --git a/components/statistic/Countdown.jsx b/components/statistic/Countdown.jsx
index 16254980f..97dc20101 100644
--- a/components/statistic/Countdown.jsx
+++ b/components/statistic/Countdown.jsx
@@ -17,24 +17,16 @@ export default {
     format: 'HH:mm:ss',
   }),
 
-  data() {
-    return {
-      uniKey: 0,
-    };
+  created() {
+    this.countdownId = undefined;
   },
 
-  countdownId: undefined,
-
   mounted() {
-    this.$nextTick(() => {
-      this.syncTimer();
-    });
+    this.syncTimer();
   },
 
   updated() {
-    this.$nextTick(() => {
-      this.syncTimer();
-    });
+    this.syncTimer();
   },
 
   beforeDestroy() {
@@ -53,11 +45,9 @@ export default {
     },
 
     startTimer() {
-      if (this.countdownId) {
-        return;
-      }
+      if (this.countdownId) return;
       this.countdownId = window.setInterval(() => {
-        this.uniKey++;
+        this.$refs.statistic.$forceUpdate();
       }, REFRESH_INTERVAL);
     },
 
@@ -74,7 +64,7 @@ export default {
       }
     },
 
-    formatCountdown(value, config) {
+    formatCountdown({ value, config }) {
       const { format } = this.$props;
       return formatCountdown(value, { ...config, format });
     },
@@ -91,13 +81,14 @@ export default {
   render() {
     return (
       <Statistic
-        key={this.uniKey}
+        ref="statistic"
         {...{
           props: {
             ...this.$props,
             valueRender: this.valueRenderHtml,
             formatter: this.formatCountdown,
           },
+          on: this.$listeners,
         }}
       />
     );
diff --git a/components/statistic/Number.jsx b/components/statistic/Number.jsx
index f09aa39f9..49a1a1f6f 100644
--- a/components/statistic/Number.jsx
+++ b/components/statistic/Number.jsx
@@ -12,12 +12,11 @@ export default {
       groupSeparator = '',
       prefixCls,
     } = context.props;
-
     let valueNode;
 
     if (typeof formatter === 'function') {
       // Customize formatter
-      valueNode = formatter(value);
+      valueNode = formatter({ value, h });
     } else {
       // Internal formatter
       const val = String(value);
diff --git a/components/statistic/Statistic.jsx b/components/statistic/Statistic.jsx
index 336ec3d03..fee065f27 100644
--- a/components/statistic/Statistic.jsx
+++ b/components/statistic/Statistic.jsx
@@ -8,7 +8,7 @@ export const StatisticProps = {
   decimalSeparator: PropTypes.string,
   groupSeparator: PropTypes.string,
   format: PropTypes.string,
-  value: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+  value: PropTypes.oneOfType([PropTypes.string, PropTypes.number, PropTypes.object]),
   valueStyle: PropTypes.any,
   valueRender: PropTypes.any,
   formatter: PropTypes.any,
@@ -21,7 +21,6 @@ export const StatisticProps = {
 export default {
   name: 'AStatistic',
   props: initDefaultProps(StatisticProps, {
-    prefixCls: 'ant-statistic',
     decimalSeparator: '.',
     groupSeparator: ',',
   }),
@@ -37,9 +36,9 @@ export default {
     const title = getComponentFromProp(this, 'title');
     let prefix = getComponentFromProp(this, 'prefix');
     let suffix = getComponentFromProp(this, 'suffix');
-    const formatter = getComponentFromProp(this, 'formatter');
+    const formatter = getComponentFromProp(this, 'formatter', {}, false);
     let valueNode = (
-      <StatisticNumber {...{ props: this.$props }} value={value} formatter={formatter} />
+      <StatisticNumber {...{ props: { ...this.$props, prefixCls, value, formatter } }} />
     );
     if (valueRender) {
       valueNode = valueRender(valueNode);
diff --git a/components/statistic/__tests__/__snapshots__/index.test.js.snap b/components/statistic/__tests__/__snapshots__/index.test.js.snap
new file mode 100644
index 000000000..42bf7e0b2
--- /dev/null
+++ b/components/statistic/__tests__/__snapshots__/index.test.js.snap
@@ -0,0 +1,8 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Statistic support negetive number 1`] = `
+<div class="ant-statistic">
+  <div class="ant-statistic-title">Account Balance (CNY)</div>
+  <div class="ant-statistic-content"><span class="ant-statistic-content-value"><span class="ant-statistic-content-value-int">-112,893</span><span class="ant-statistic-content-value-decimal">.12</span></span></div>
+</div>
+`;
diff --git a/components/statistic/__tests__/index.test.js b/components/statistic/__tests__/index.test.js
new file mode 100644
index 000000000..a6755b9e2
--- /dev/null
+++ b/components/statistic/__tests__/index.test.js
@@ -0,0 +1,107 @@
+import { mount } from '@vue/test-utils';
+import { asyncExpect } from '@/tests/utils';
+import MockDate from 'mockdate';
+import moment from 'moment';
+import Statistic from '..';
+
+describe('Statistic', () => {
+  beforeAll(() => {
+    MockDate.set(moment('2018-11-28 00:00:00'));
+  });
+
+  afterAll(() => {
+    MockDate.reset();
+  });
+
+  it('customize formatter', () => {
+    const formatter = jest.fn(() => 93);
+    const props = {
+      propsData: {
+        value: 1128,
+        formatter,
+      },
+    };
+    const wrapper = mount(Statistic, props);
+    expect(formatter).toBeCalledWith(expect.objectContaining({ value: 1128 }));
+    expect(wrapper.find('.ant-statistic-content-value').text()).toEqual('93');
+  });
+
+  it('groupSeparator', () => {
+    const props = {
+      propsData: {
+        value: 1128,
+        groupSeparator: '__TEST__',
+      },
+    };
+    const wrapper = mount(Statistic, props);
+    expect(wrapper.find('.ant-statistic-content-value').text()).toEqual('1__TEST__128');
+  });
+
+  it('not a number', () => {
+    const props = {
+      propsData: {
+        value: 'bamboo',
+      },
+    };
+    const wrapper = mount(Statistic, props);
+    expect(wrapper.find('.ant-statistic-content-value').text()).toEqual('bamboo');
+  });
+
+  it('support negetive number', () => {
+    const props = {
+      propsData: {
+        title: 'Account Balance (CNY)',
+        value: -112893.12345,
+        precision: 2,
+      },
+    };
+    const wrapper = mount(Statistic, props);
+    expect(wrapper.html()).toMatchSnapshot();
+  });
+
+  describe('Countdown', () => {
+    it('render correctly', () => {
+      const now = moment()
+        .add(2, 'd')
+        .add(11, 'h')
+        .add(28, 'm')
+        .add(9, 's')
+        .add(3, 'ms');
+
+      [
+        ['H:m:s', '59:28:9'],
+        ['HH:mm:ss', '59:28:09'],
+        ['HH:mm:ss:SSS', '59:28:09:003'],
+        ['DD-HH:mm:ss', '02-11:28:09'],
+      ].forEach(([format, value]) => {
+        const props = {
+          propsData: {
+            format,
+            value: now,
+          },
+        };
+        const wrapper = mount(Statistic.Countdown, props);
+        expect(wrapper.find('.ant-statistic-content-value').text()).toEqual(value);
+      });
+    });
+
+    it('time going', async () => {
+      const now = Date.now() + 1000;
+      const props = {
+        propsData: {
+          value: now,
+        },
+      };
+      const wrapper = mount(Statistic.Countdown, props);
+
+      // setInterval should work
+      const instance = wrapper.vm;
+      expect(instance.countdownId).not.toBe(undefined);
+
+      // await delay(50);
+
+      // wrapper.unmount();
+      // expect(instance.countdownId).toBe(undefined);
+    });
+  });
+});
diff --git a/components/statistic/index.en-US.md b/components/statistic/index.en-US.md
index e60bcb350..c47ec8532 100644
--- a/components/statistic/index.en-US.md
+++ b/components/statistic/index.en-US.md
@@ -5,13 +5,14 @@
 | Property | Description | Type | Default |
 | -------- | ----------- | ---- | ------- |
 | decimalSeparator | decimal separator | string | . |
-| formatter | customize value display logic | v-slot \|(h) => VNode | - |
+| formatter | customize value display logic | v-slot \|({h, value}) => VNode | - |
 | groupSeparator | group separator | string | , |
 | precision | precision of input value | number | - |
 | prefix | prefix node of value | string \| v-slot | - |
 | suffix | suffix node of value | string \| v-slot | - |
 | title | Display title | string \| v-slot | - |
 | value | Display value | string \| number | - |
+| valueStyle | Set value css style | style | - |
 
 
 ### Statistic.Countdown
@@ -23,6 +24,7 @@
 | suffix | suffix node of value | string \| v-slot | - |
 | title | Display title | string \| v-slot | - |
 | value | Set target countdown time | number \| moment | - |
+| valueStyle | Set value css style | style | - |
 
 #### Statistic.Countdown Events
 | Events Name | Description | Arguments |
diff --git a/components/statistic/index.js b/components/statistic/index.js
index 5a13e5d6a..e464f189f 100644
--- a/components/statistic/index.js
+++ b/components/statistic/index.js
@@ -1,9 +1,11 @@
 import Statistic from './Statistic';
 import Countdown from './Countdown';
+import Base from '../base';
 
 Statistic.Countdown = Countdown;
 /* istanbul ignore next */
 Statistic.install = function(Vue) {
+  Vue.use(Base);
   Vue.component(Statistic.name, Statistic);
   Vue.component(Statistic.Countdown.name, Statistic.Countdown);
 };
diff --git a/components/statistic/index.zh-CN.md b/components/statistic/index.zh-CN.md
index 88dde6235..cb28be015 100644
--- a/components/statistic/index.zh-CN.md
+++ b/components/statistic/index.zh-CN.md
@@ -5,13 +5,14 @@
 | 参数 | 说明 | 类型 | 默认值 |
 | -------- | ----------- | ---- | ------- |
 | decimalSeparator | 设置小数点 | string | . |
-| formatter | 自定义数值展示 | v-slot \| (h) => VNode | - |
+| formatter | 自定义数值展示 | v-slot \| ({h, value}) => VNode | - |
 | groupSeparator | 设置千分位标识符 | string | , |
 | precision | 数值精度 | number | - |
 | prefix | 设置数值的前缀 | string \| v-slot | - |
 | suffix | 设置数值的后缀 | string \| v-slot | - |
 | title | 数值的标题 | string \| v-slot | - |
 | value | 数值内容 | string \| number | - |
+| valueStyle | 设置数值的样式 | style | - |
 
 ### Statistic.Countdown
 
@@ -22,6 +23,7 @@
 | suffix | 设置数值的后缀 | string \| v-slot | - |
 | title | 数值的标题 | string \| v-slot | - |
 | value | 数值内容 | number \| moment | - |
+| valueStyle | 设置数值的样式 | style | - |
 
 #### Statistic.Countdown事件
 | 事件名称 | 说明 | 回调参数 |
diff --git a/components/tree/Tree.jsx b/components/tree/Tree.jsx
index 136c3d738..8fd7c7ceb 100644
--- a/components/tree/Tree.jsx
+++ b/components/tree/Tree.jsx
@@ -141,7 +141,6 @@ export default {
           const switcherOriginCls = getClass(switcherIcon[0]);
           return cloneElement(switcherIcon, {
             class: {
-              ...switcherOriginCls,
               [switcherCls]: true,
             },
           });
diff --git a/components/tree/demo/customized-icon.md b/components/tree/demo/customized-icon.md
index 0bf711e39..2de451364 100644
--- a/components/tree/demo/customized-icon.md
+++ b/components/tree/demo/customized-icon.md
@@ -16,7 +16,7 @@ You can customize icons for different nodes.
     defaultExpandAll
     :defaultSelectedKeys="['0-0-0']"
   >
-    <a-icon type="down" slot="switcherIcon" />
+    <a-icon type="down" slot="switcherIcon" class="test" />
     <a-icon slot="smile" type="smile-o" />
     <a-icon slot="meh" type="smile-o" />
     <template slot="custom" slot-scope="{selected}">
diff --git a/components/tree/index.en-US.md b/components/tree/index.en-US.md
index 7fd4bbd16..3c2cebe57 100644
--- a/components/tree/index.en-US.md
+++ b/components/tree/index.en-US.md
@@ -24,7 +24,7 @@
 | multiple | Allows selecting multiple treeNodes | boolean | false |
 | selectedKeys(.sync) | (Controlled) Specifies the keys of the selected treeNodes | string\[] \| number\[] | - |
 | showIcon | Shows the icon before a TreeNode's title. There is no default style; you must set a custom style for it if set to `true` | boolean | false |
-| switcherIcon | customize collapse/expand icon of tree node | slot(vnode) | - |
+| switcherIcon | customize collapse/expand icon of tree node | slot | - |
 | showLine | Shows a connecting line | boolean | false |
 
 ### Events
diff --git a/components/tree/index.zh-CN.md b/components/tree/index.zh-CN.md
index a492c648e..0122debe9 100644
--- a/components/tree/index.zh-CN.md
+++ b/components/tree/index.zh-CN.md
@@ -24,7 +24,7 @@
 | multiple | 支持点选多个节点（节点本身） | boolean | false |
 | selectedKeys(.sync) | （受控）设置选中的树节点 | string\[] \| number\[] | - |
 | showIcon | 是否展示 TreeNode title 前的图标，没有默认样式，如设置为 true，需要自行定义图标相关样式 | boolean | false |
-| switcherIcon | 自定义树节点的展开/折叠图标 | slot(vnode) | - |
+| switcherIcon | 自定义树节点的展开/折叠图标 | slot | - |
 | showLine | 是否展示连接线 | boolean | false |
 
 
diff --git a/types/rate.d.ts b/types/rate.d.ts
index 6bdd3ccb4..aa2bbbad6 100644
--- a/types/rate.d.ts
+++ b/types/rate.d.ts
@@ -60,6 +60,8 @@ export declare class Rate extends AntdComponent {
    */
   value: number;
 
+  tooltips: Array<string>;
+
   /**
    * remove focus
    */
diff --git a/types/statistic/statistic-countdown.d.ts b/types/statistic/statistic-countdown.d.ts
new file mode 100644
index 000000000..499d106b9
--- /dev/null
+++ b/types/statistic/statistic-countdown.d.ts
@@ -0,0 +1,34 @@
+// Project: https://github.com/vueComponent/ant-design-vue
+// Definitions by: akki-jat <https://github.com/akki-jat>
+// Definitions: https://github.com/vueComponent/ant-design-vue/types
+
+import { AntdComponent } from '../component';
+import { VNode } from 'vue';
+
+export declare class AStatisticCountdown extends AntdComponent {
+  format: string;
+  /**
+   * prefix node of value
+   * @type string | VNode
+   */
+  prefix: string | VNode;
+
+  /**
+   * suffix node of value
+   * @type string | VNode
+   */
+  suffix: string | VNode;
+
+  /**
+   * Display title
+   * @type string | VNode
+   */
+  title: string | VNode;
+
+  /**
+   * Display value
+   * @type string or number
+   */
+  value: string | number;
+  valueStyle: object;
+}
diff --git a/types/statistic.ts b/types/statistic/statistic.d.ts
similarity index 85%
rename from types/statistic.ts
rename to types/statistic/statistic.d.ts
index d24320de7..4d47592f2 100644
--- a/types/statistic.ts
+++ b/types/statistic/statistic.d.ts
@@ -2,10 +2,12 @@
 // Definitions by: akki-jat <https://github.com/akki-jat>
 // Definitions: https://github.com/vueComponent/ant-design-vue/types
 
-import { AntdComponent } from './component';
+import { AntdComponent } from '../component';
 import { VNode } from 'vue';
+import AStatisticCountdown from './statistic-countdown';
 
 export declare class Statistic extends AntdComponent {
+  static AStatisticCountdown: typeof AStatisticCountdown;
   /**
    * decimal separator
    * @default '.'