diff --git a/components/badge/Badge.tsx b/components/badge/Badge.tsx
index 4a3b263de..49c957e3a 100644
--- a/components/badge/Badge.tsx
+++ b/components/badge/Badge.tsx
@@ -1,27 +1,39 @@
 import PropTypes from '../_util/vue-types';
 import ScrollNumber from './ScrollNumber';
 import classNames from '../_util/classNames';
-import { initDefaultProps, getComponent, getSlot } from '../_util/props-util';
+import { getPropsSlot, flattenChildren } from '../_util/props-util';
 import { cloneElement } from '../_util/vnode';
 import { getTransitionProps, Transition } from '../_util/transition';
 import isNumeric from '../_util/isNumeric';
 import { defaultConfigProvider } from '../config-provider';
-import { inject, defineComponent, CSSProperties, VNode, App, Plugin } from 'vue';
+import {
+  inject,
+  defineComponent,
+  ExtractPropTypes,
+  CSSProperties,
+  VNode,
+  App,
+  Plugin,
+  reactive,
+  computed,
+} from 'vue';
 import { tuple } from '../_util/type';
 import Ribbon from './Ribbon';
 import { isPresetColor } from './utils';
 
-const BadgeProps = {
+export const badgeProps = {
   /** Number to show in badge */
   count: PropTypes.VNodeChild,
   showZero: PropTypes.looseBool,
   /** Max count to show */
-  overflowCount: PropTypes.number,
+  overflowCount: PropTypes.number.def(99),
   /** whether to show red dot without number */
   dot: PropTypes.looseBool,
   prefixCls: PropTypes.string,
   scrollNumberPrefixCls: PropTypes.string,
   status: PropTypes.oneOf(tuple('success', 'processing', 'default', 'error', 'warning')),
+  // sync antd@4.6.0
+  size: PropTypes.oneOf(tuple('default', 'small')).def('default'),
   color: PropTypes.string,
   text: PropTypes.VNodeChild,
   offset: PropTypes.arrayOf(PropTypes.oneOfType([String, Number])),
@@ -29,48 +41,44 @@ const BadgeProps = {
   title: PropTypes.string,
 };
 
+export type BadgeProps = Partial<ExtractPropTypes<typeof badgeProps>>;
+
 const Badge = defineComponent({
   name: 'ABadge',
   Ribbon,
-  props: initDefaultProps(BadgeProps, {
-    showZero: false,
-    dot: false,
-    overflowCount: 99,
-  }) as typeof BadgeProps,
-  setup() {
-    return {
-      configProvider: inject('configProvider', defaultConfigProvider),
+  props: badgeProps,
+  setup(props, { slots }) {
+    const configProvider = inject('configProvider', defaultConfigProvider);
+    const state = reactive({
       badgeCount: undefined,
-    };
-  },
-  methods: {
-    getNumberedDispayCount() {
-      const { overflowCount } = this.$props;
-      const count = this.badgeCount;
+    });
+
+    const getNumberedDispayCount = () => {
+      const { overflowCount } = props;
+      const count = state.badgeCount;
       const displayCount = count > overflowCount ? `${overflowCount}+` : count;
       return displayCount;
-    },
+    };
 
-    getDispayCount() {
-      const isDot = this.isDot();
+    const getDispayCount = computed(() => {
       // dot mode don't need count
-      if (isDot) {
+      if (isDot.value) {
         return '';
       }
-      return this.getNumberedDispayCount();
-    },
+      return getNumberedDispayCount();
+    });
 
-    getScrollNumberTitle() {
-      const { title } = this.$props;
-      const count = this.badgeCount;
+    const getScrollNumberTitle = () => {
+      const { title } = props;
+      const count = state.badgeCount;
       if (title) {
         return title;
       }
       return typeof count === 'string' || typeof count === 'number' ? count : undefined;
-    },
+    };
 
-    getStyleWithOffset() {
-      const { offset, numberStyle } = this.$props;
+    const getStyleWithOffset = () => {
+      const { offset, numberStyle } = props;
       return offset
         ? {
             right: `${-parseInt(offset[0] as string, 10)}px`,
@@ -78,47 +86,49 @@ const Badge = defineComponent({
             ...numberStyle,
           }
         : { ...numberStyle };
-    },
-    getBadgeClassName(prefixCls: string, children: VNode[]) {
-      const hasStatus = this.hasStatus();
+    };
+
+    const hasStatus = computed(() => {
+      const { status, color } = props;
+      return !!status || !!color;
+    });
+
+    const isZero = computed(() => {
+      const numberedDispayCount = getNumberedDispayCount();
+      return numberedDispayCount === '0' || numberedDispayCount === 0;
+    });
+
+    const isDot = computed(() => {
+      const { dot } = props;
+      return (dot && !isZero.value) || hasStatus.value;
+    });
+
+    const isHidden = computed(() => {
+      const { showZero } = props;
+      const isEmpty =
+        getDispayCount.value === null ||
+        getDispayCount.value === undefined ||
+        getDispayCount.value === '';
+      return (isEmpty || (isZero.value && !showZero)) && !isDot.value;
+    });
+
+    const renderStatusText = (prefixCls: string) => {
+      const text = getPropsSlot(slots, props, 'text');
+      const hidden = isHidden.value;
+      return hidden || !text ? null : <span class={`${prefixCls}-status-text`}>{text}</span>;
+    };
+
+    const getBadgeClassName = (prefixCls: string, children: VNode[]) => {
+      const status = hasStatus.value;
       return classNames(prefixCls, {
-        [`${prefixCls}-status`]: hasStatus,
-        [`${prefixCls}-dot-status`]: hasStatus && this.dot && !this.isZero(),
+        [`${prefixCls}-status`]: status,
+        [`${prefixCls}-dot-status`]: status && props.dot && !isZero.value,
         [`${prefixCls}-not-a-wrapper`]: !children.length,
       });
-    },
-    hasStatus() {
-      const { status, color } = this.$props;
-      return !!status || !!color;
-    },
-    isZero() {
-      const numberedDispayCount = this.getNumberedDispayCount();
-      return numberedDispayCount === '0' || numberedDispayCount === 0;
-    },
+    };
 
-    isDot() {
-      const { dot } = this.$props;
-      const isZero = this.isZero();
-      return (dot && !isZero) || this.hasStatus();
-    },
-
-    isHidden() {
-      const { showZero } = this.$props;
-      const displayCount = this.getDispayCount();
-      const isZero = this.isZero();
-      const isDot = this.isDot();
-      const isEmpty = displayCount === null || displayCount === undefined || displayCount === '';
-      return (isEmpty || (isZero && !showZero)) && !isDot;
-    },
-
-    renderStatusText(prefixCls: string) {
-      const text = getComponent(this, 'text');
-      const hidden = this.isHidden();
-      return hidden || !text ? null : <span class={`${prefixCls}-status-text`}>{text}</span>;
-    },
-
-    renderDispayComponent() {
-      const count = this.badgeCount;
+    const renderDispayComponent = () => {
+      const count = state.badgeCount;
       const customNode = count;
       if (!customNode || typeof customNode !== 'object') {
         return undefined;
@@ -126,103 +136,102 @@ const Badge = defineComponent({
       return cloneElement(
         customNode,
         {
-          style: this.getStyleWithOffset(),
+          style: getStyleWithOffset(),
         },
         false,
       );
-    },
+    };
 
-    renderBadgeNumber(prefixCls: string, scrollNumberPrefixCls: string) {
-      const { status, color } = this.$props;
-      const count = this.badgeCount;
-      const displayCount = this.getDispayCount();
-      const isDot = this.isDot();
-      const hidden = this.isHidden();
+    const renderBadgeNumber = (prefixCls: string, scrollNumberPrefixCls: string) => {
+      const { status, color, size } = props;
+      const count = state.badgeCount;
+      const displayCount = getDispayCount.value;
 
       const scrollNumberCls = {
-        [`${prefixCls}-dot`]: isDot,
-        [`${prefixCls}-count`]: !isDot,
+        [`${prefixCls}-dot`]: isDot.value,
+        [`${prefixCls}-count`]: !isDot.value,
+        [`${prefixCls}-count-sm`]: size === 'small',
         [`${prefixCls}-multiple-words`]:
-          !isDot && count && count.toString && count.toString().length > 1,
+          !isDot.value && count && count.toString && count.toString().length > 1,
         [`${prefixCls}-status-${status}`]: !!status,
         [`${prefixCls}-status-${color}`]: isPresetColor(color),
       };
 
-      let statusStyle = this.getStyleWithOffset();
+      let statusStyle = getStyleWithOffset();
       if (color && !isPresetColor(color)) {
         statusStyle = statusStyle || {};
         statusStyle.background = color;
       }
 
-      return hidden ? null : (
+      return isHidden.value ? null : (
         <ScrollNumber
           prefixCls={scrollNumberPrefixCls}
-          data-show={!hidden}
-          v-show={!hidden}
+          data-show={!isHidden.value}
+          v-show={!isHidden.value}
           class={scrollNumberCls}
           count={displayCount}
-          displayComponent={this.renderDispayComponent()}
-          title={this.getScrollNumberTitle()}
+          displayComponent={renderDispayComponent()}
+          title={getScrollNumberTitle()}
           style={statusStyle}
           key="scrollNumber"
         />
       );
-    },
-  },
+    };
 
-  render() {
-    const {
-      prefixCls: customizePrefixCls,
-      scrollNumberPrefixCls: customizeScrollNumberPrefixCls,
-      status,
-      color,
-    } = this;
+    return () => {
+      const {
+        prefixCls: customizePrefixCls,
+        scrollNumberPrefixCls: customizeScrollNumberPrefixCls,
+        status,
+        color,
+      } = props;
 
-    const text = getComponent(this, 'text');
-    const getPrefixCls = this.configProvider.getPrefixCls;
-    const prefixCls = getPrefixCls('badge', customizePrefixCls);
-    const scrollNumberPrefixCls = getPrefixCls('scroll-number', customizeScrollNumberPrefixCls);
+      const text = getPropsSlot(slots, props, 'text');
+      const getPrefixCls = configProvider.getPrefixCls;
+      const prefixCls = getPrefixCls('badge', customizePrefixCls);
+      const scrollNumberPrefixCls = getPrefixCls('scroll-number', customizeScrollNumberPrefixCls);
 
-    const children = getSlot(this);
-    let count = getComponent(this, 'count');
-    if (Array.isArray(count)) {
-      count = count[0];
-    }
-    this.badgeCount = count;
-    const scrollNumber = this.renderBadgeNumber(prefixCls, scrollNumberPrefixCls);
-    const statusText = this.renderStatusText(prefixCls);
-    const statusCls = classNames({
-      [`${prefixCls}-status-dot`]: this.hasStatus(),
-      [`${prefixCls}-status-${status}`]: !!status,
-      [`${prefixCls}-status-${color}`]: isPresetColor(color),
-    });
-    const statusStyle: CSSProperties = {};
-    if (color && !isPresetColor(color)) {
-      statusStyle.background = color;
-    }
-    // <Badge status="success" />
-    if (!children.length && this.hasStatus()) {
-      const styleWithOffset = this.getStyleWithOffset();
-      const statusTextColor = styleWithOffset && styleWithOffset.color;
-      return (
-        <span class={this.getBadgeClassName(prefixCls, children)} style={styleWithOffset}>
-          <span class={statusCls} style={statusStyle} />
-          <span style={{ color: statusTextColor }} class={`${prefixCls}-status-text`}>
-            {text}
+      const children = flattenChildren(slots.default?.());
+      let count = getPropsSlot(slots, props, 'count');
+      if (Array.isArray(count)) {
+        count = count[0];
+      }
+      state.badgeCount = count;
+      const scrollNumber = renderBadgeNumber(prefixCls, scrollNumberPrefixCls);
+      const statusText = renderStatusText(prefixCls);
+      const statusCls = classNames({
+        [`${prefixCls}-status-dot`]: hasStatus.value,
+        [`${prefixCls}-status-${status}`]: !!status,
+        [`${prefixCls}-status-${color}`]: isPresetColor(color),
+      });
+      const statusStyle: CSSProperties = {};
+      if (color && !isPresetColor(color)) {
+        statusStyle.background = color;
+      }
+      // <Badge status="success" />
+      if (!children.length && hasStatus.value) {
+        const styleWithOffset = getStyleWithOffset();
+        const statusTextColor = styleWithOffset && styleWithOffset.color;
+        return (
+          <span class={getBadgeClassName(prefixCls, children)} style={styleWithOffset}>
+            <span class={statusCls} style={statusStyle} />
+            <span style={{ color: statusTextColor }} class={`${prefixCls}-status-text`}>
+              {text}
+            </span>
           </span>
+        );
+      }
+
+      const transitionProps = getTransitionProps(children.length ? `${prefixCls}-zoom` : '');
+
+      return (
+        <span class={getBadgeClassName(prefixCls, children)}>
+          {children}
+          <Transition {...transitionProps}>{scrollNumber}</Transition>
+          {statusText}
         </span>
       );
-    }
-
-    const transitionProps = getTransitionProps(children.length ? `${prefixCls}-zoom` : '');
-
-    return (
-      <span class={this.getBadgeClassName(prefixCls, children)}>
-        {children}
-        <Transition {...transitionProps}>{scrollNumber}</Transition>
-        {statusText}
-      </span>
-    );
+    };
   },
 });
 
diff --git a/components/badge/ScrollNumber.tsx b/components/badge/ScrollNumber.tsx
index 6d2b7629f..dfe22dd30 100644
--- a/components/badge/ScrollNumber.tsx
+++ b/components/badge/ScrollNumber.tsx
@@ -1,10 +1,20 @@
 import classNames from '../_util/classNames';
 import PropTypes from '../_util/vue-types';
-import BaseMixin from '../_util/BaseMixin';
-import omit from 'omit.js';
+import { omit } from 'lodash-es';
 import { cloneElement } from '../_util/vnode';
 import { defaultConfigProvider } from '../config-provider';
-import { CSSProperties, defineComponent, inject } from 'vue';
+import {
+  defineComponent,
+  inject,
+  nextTick,
+  onBeforeUnmount,
+  onUpdated,
+  reactive,
+  watch,
+  ExtractPropTypes,
+  CSSProperties,
+  DefineComponent,
+} from 'vue';
 
 function getNumberArray(num: string | number | undefined | null) {
   return num
@@ -19,7 +29,7 @@ function getNumberArray(num: string | number | undefined | null) {
     : [];
 }
 
-const ScrollNumberProps = {
+export const scrollNumberProps = {
   prefixCls: PropTypes.string,
   count: PropTypes.any,
   component: PropTypes.string,
@@ -28,68 +38,30 @@ const ScrollNumberProps = {
   onAnimated: PropTypes.func,
 };
 
+export type ScrollNumberProps = ExtractPropTypes<typeof scrollNumberProps>;
+
 export default defineComponent({
   name: 'ScrollNumber',
-  mixins: [BaseMixin],
   inheritAttrs: false,
-  props: ScrollNumberProps,
+  props: scrollNumberProps,
   emits: ['animated'],
-  setup() {
-    return {
-      configProvider: inject('configProvider', defaultConfigProvider),
-      lastCount: undefined,
-      timeout: undefined,
-    };
-  },
-  data() {
-    return {
+  setup(props, { emit, attrs }) {
+    const configProvider = inject('configProvider', defaultConfigProvider);
+    const state = reactive({
       animateStarted: true,
-      sCount: this.count,
-    };
-  },
-  watch: {
-    count() {
-      this.lastCount = this.sCount;
-      this.setState({
-        animateStarted: true,
-      });
-    },
-  },
-  updated() {
-    const { animateStarted, count } = this;
-    if (animateStarted) {
-      this.clearTimeout();
-      // Let browser has time to reset the scroller before actually
-      // performing the transition.
-      this.timeout = setTimeout(() => {
-        this.setState(
-          {
-            animateStarted: false,
-            sCount: count,
-          },
-          this.handleAnimated,
-        );
-      });
-    }
-  },
-  beforeUnmount() {
-    this.clearTimeout();
-  },
-  methods: {
-    clearTimeout() {
-      if (this.timeout) {
-        clearTimeout(this.timeout);
-        this.timeout = undefined;
-      }
-    },
-    getPositionByNum(num: number, i: number) {
-      const { sCount } = this;
-      const currentCount = Math.abs(Number(sCount));
-      const lastCount = Math.abs(Number(this.lastCount));
-      const currentDigit = Math.abs(getNumberArray(sCount)[i] as number);
-      const lastDigit = Math.abs(getNumberArray(this.lastCount)[i] as number);
+      lastCount: undefined,
+      sCount: props.count,
 
-      if (this.animateStarted) {
+      timeout: undefined,
+    });
+
+    const getPositionByNum = (num: number, i: number) => {
+      const currentCount = Math.abs(Number(state.sCount));
+      const lastCount = Math.abs(Number(state.lastCount));
+      const currentDigit = Math.abs(getNumberArray(state.sCount)[i] as number);
+      const lastDigit = Math.abs(getNumberArray(state.lastCount)[i] as number);
+
+      if (state.animateStarted) {
         return 10 + num;
       }
       // 同方向则在同一侧切换数字
@@ -103,12 +75,19 @@ export default defineComponent({
         return 10 + num;
       }
       return num;
-    },
-    handleAnimated() {
-      this.$emit('animated');
-    },
+    };
+    const handleAnimated = () => {
+      emit('animated');
+    };
 
-    renderNumberList(position: number, className: string) {
+    const _clearTimeout = () => {
+      if (state.timeout) {
+        clearTimeout(state.timeout);
+        state.timeout = undefined;
+      }
+    };
+
+    const renderNumberList = (position: number, className: string) => {
       const childrenToReturn = [];
       for (let i = 0; i < 30; i++) {
         childrenToReturn.push(
@@ -122,14 +101,14 @@ export default defineComponent({
           </p>,
         );
       }
-
       return childrenToReturn;
-    },
-    renderCurrentNumber(prefixCls: string, num: number | string, i: number) {
+    };
+
+    const renderCurrentNumber = (prefixCls: string, num: number | string, i: number) => {
       if (typeof num === 'number') {
-        const position = this.getPositionByNum(num, i);
+        const position = getPositionByNum(num, i);
         const removeTransition =
-          this.animateStarted || getNumberArray(this.lastCount)[i] === undefined;
+          state.animateStarted || getNumberArray(state.lastCount)[i] === undefined;
         const style = {
           transition: removeTransition ? 'none' : undefined,
           msTransform: `translateY(${-position * 100}%)`,
@@ -138,7 +117,7 @@ export default defineComponent({
         };
         return (
           <span class={`${prefixCls}-only`} style={style} key={i}>
-            {this.renderNumberList(position, `${prefixCls}-only-unit`)}
+            {renderNumberList(position, `${prefixCls}-only-unit`)}
           </span>
         );
       }
@@ -147,57 +126,92 @@ export default defineComponent({
           {num}
         </span>
       );
-    },
+    };
 
-    renderNumberElement(prefixCls: string) {
-      const { sCount } = this;
-      if (sCount && Number(sCount) % 1 === 0) {
-        return getNumberArray(sCount)
-          .map((num, i) => this.renderCurrentNumber(prefixCls, num, i))
+    const renderNumberElement = (prefixCls: string) => {
+      if (state.sCount && Number(state.sCount) % 1 === 0) {
+        return getNumberArray(state.sCount)
+          .map((num, i) => renderCurrentNumber(prefixCls, num, i))
           .reverse();
       }
-      return sCount;
-    },
-  },
-
-  render() {
-    const { prefixCls: customizePrefixCls, title, component: Tag = 'sup', displayComponent } = this;
-    const getPrefixCls = this.configProvider.getPrefixCls;
-    const prefixCls = getPrefixCls('scroll-number', customizePrefixCls);
-    const { class: className, style = {} } = this.$attrs as {
-      class?: string;
-      style?: CSSProperties;
+      return state.sCount;
     };
-    if (displayComponent) {
-      return cloneElement(displayComponent, {
-        class: classNames(
-          `${prefixCls}-custom-component`,
-          displayComponent.props && displayComponent.props.class,
-        ),
-      });
-    }
-    // fix https://fb.me/react-unknown-prop
-    const restProps = omit({ ...this.$props, ...this.$attrs }, [
-      'count',
-      'onAnimated',
-      'component',
-      'prefixCls',
-      'displayComponent',
-    ]);
-    const tempStyle = { ...style };
-    const newProps = {
-      ...restProps,
-      title,
-      style: tempStyle,
-      class: classNames(prefixCls, className),
-    };
-    // allow specify the border
-    // mock border-color by box-shadow for compatible with old usage:
-    // <Badge count={4} style={{ backgroundColor: '#fff', color: '#999', borderColor: '#d9d9d9' }} />
-    if (style && style.borderColor) {
-      newProps.style.boxShadow = `0 0 0 1px ${style.borderColor} inset`;
-    }
 
-    return <Tag {...newProps}>{this.renderNumberElement(prefixCls)}</Tag>;
+    watch(
+      () => props.count,
+      () => {
+        state.lastCount = state.sCount;
+        state.animateStarted = true;
+      },
+    );
+
+    onUpdated(() => {
+      if (state.animateStarted) {
+        _clearTimeout();
+        // Let browser has time to reset the scroller before actually
+        // performing the transition.
+        state.timeout = setTimeout(() => {
+          state.animateStarted = false;
+          state.sCount = props.count;
+          nextTick(() => {
+            handleAnimated();
+          });
+        });
+      }
+    });
+
+    onBeforeUnmount(() => {
+      _clearTimeout();
+    });
+
+    // configProvider: inject('configProvider', defaultConfigProvider),
+    // lastCount: undefined,
+    // timeout: undefined,
+
+    return () => {
+      const {
+        prefixCls: customizePrefixCls,
+        title,
+        component: Tag = ('sup' as unknown) as DefineComponent,
+        displayComponent,
+      } = props;
+      const getPrefixCls = configProvider.getPrefixCls;
+      const prefixCls = getPrefixCls('scroll-number', customizePrefixCls);
+      const { class: className, style = {} } = attrs as {
+        class?: string;
+        style?: CSSProperties;
+      };
+      if (displayComponent) {
+        return cloneElement(displayComponent, {
+          class: classNames(
+            `${prefixCls}-custom-component`,
+            displayComponent.props && displayComponent.props.class,
+          ),
+        });
+      }
+      // fix https://fb.me/react-unknown-prop
+      const restProps = omit({ ...props, ...attrs }, [
+        'count',
+        'onAnimated',
+        'component',
+        'prefixCls',
+        'displayComponent',
+      ]);
+      const tempStyle = { ...style };
+      const newProps = {
+        ...restProps,
+        title,
+        style: tempStyle,
+        class: classNames(prefixCls, className),
+      };
+      // allow specify the border
+      // mock border-color by box-shadow for compatible with old usage:
+      // <Badge count={4} style={{ backgroundColor: '#fff', color: '#999', borderColor: '#d9d9d9' }} />
+      if (style && style.borderColor) {
+        newProps.style.boxShadow = `0 0 0 1px ${style.borderColor} inset`;
+      }
+
+      return <Tag {...newProps}>{renderNumberElement(prefixCls)}</Tag>;
+    };
   },
 });
diff --git a/components/badge/style/index.less b/components/badge/style/index.less
index a10e8918c..1bed0c228 100644
--- a/components/badge/style/index.less
+++ b/components/badge/style/index.less
@@ -31,6 +31,15 @@
     }
   }
 
+  &-count-sm {
+    min-width: @badge-height-sm;
+    height: @badge-height-sm;
+    padding: 0;
+    font-size: @badge-font-size-sm;
+    line-height: @badge-height-sm;
+    border-radius: (@badge-height-sm / 2);
+  }
+
   &-multiple-words {
     padding: 0 8px;
   }
diff --git a/components/style/themes/default.less b/components/style/themes/default.less
index 2bc651de7..45787fea5 100644
--- a/components/style/themes/default.less
+++ b/components/style/themes/default.less
@@ -581,11 +581,14 @@
 // Badge
 // ---
 @badge-height: 20px;
+@badge-height-sm: 14px;
 @badge-dot-size: 6px;
 @badge-font-size: @font-size-sm;
+@badge-font-size-sm: @font-size-sm;
 @badge-font-weight: normal;
 @badge-status-size: 6px;
 @badge-text-color: @component-background;
+@badge-color: @highlight-color;
 
 // Rate
 // ---