diff --git a/packages/components/cascader-panel/src/index.vue b/packages/components/cascader-panel/src/index.vue
index 88704c352d..e7c9cfa37a 100644
--- a/packages/components/cascader-panel/src/index.vue
+++ b/packages/components/cascader-panel/src/index.vue
@@ -1,6 +1,6 @@
 <template>
   <div
-    :class="['el-cascader-panel', border && 'is-bordered']"
+    :class="[ns.b('panel'), ns.is('bordered', border)]"
     @keydown="handleKeyDown"
   >
     <el-cascader-menu
@@ -40,6 +40,7 @@ import {
   UPDATE_MODEL_EVENT,
   CHANGE_EVENT,
 } from '@element-plus/constants'
+import { useNamespace } from '@element-plus/hooks'
 
 import ElCascaderMenu from './menu.vue'
 import Store from './store'
@@ -82,6 +83,7 @@ export default defineComponent({
     // for interrupt sync check status in lazy mode
     let manualChecked = false
 
+    const ns = useNamespace('cascader')
     const config = useCascaderConfig(props)
 
     let store: Nullable<Store> = null
@@ -273,13 +275,13 @@ export default defineComponent({
       menuList.value.forEach((menu) => {
         const menuElement = menu?.$el
         if (menuElement) {
-          const container = (menuElement as HTMLElement).querySelector(
-            '.el-scrollbar__wrap'
+          const container = menuElement.querySelector(
+            `.${ns.namespace.value}scrollbar__wrap`
           )
           const activeNode =
-            menuElement.querySelector('.el-cascader-node.is-active') ||
-            menuElement.querySelector('.el-cascader-node.in-active-path')
-          scrollIntoView(container as HTMLElement, activeNode)
+            menuElement.querySelector(`.${ns.b('node')}.${ns.is('active')}`) ||
+            menuElement.querySelector(`.${ns.b('node')}.in-active-path`)
+          scrollIntoView(container, activeNode)
         }
       })
     }
@@ -294,7 +296,7 @@ export default defineComponent({
           e.preventDefault()
           const distance = code === EVENT_CODE.up ? -1 : 1
           focusNode(
-            getSibling(target, distance, '.el-cascader-node[tabindex="-1"]')
+            getSibling(target, distance, `.${ns.b('node')}[tabindex="-1"]`)
           )
           break
         }
@@ -302,7 +304,7 @@ export default defineComponent({
           e.preventDefault()
           const preMenu = menuList.value[getMenuIndex(target) - 1]
           const expandedNode = preMenu?.$el.querySelector(
-            '.el-cascader-node[aria-expanded="true"]'
+            `.${ns.b('node')}[aria-expanded="true"]`
           )
           focusNode(expandedNode)
           break
@@ -311,7 +313,7 @@ export default defineComponent({
           e.preventDefault()
           const nextMenu = menuList.value[getMenuIndex(target) + 1]
           const firstNode = nextMenu?.$el.querySelector(
-            '.el-cascader-node[tabindex="-1"]'
+            `.${ns.b('node')}[tabindex="-1"]`
           )
           focusNode(firstNode)
           break
@@ -366,6 +368,7 @@ export default defineComponent({
     onMounted(() => !isEmpty(props.modelValue) && syncCheckedValue())
 
     return {
+      ns,
       menuList,
       menus,
       checkedNodes,
diff --git a/packages/components/cascader-panel/src/menu.vue b/packages/components/cascader-panel/src/menu.vue
index b6377f3ece..a082923dd1 100644
--- a/packages/components/cascader-panel/src/menu.vue
+++ b/packages/components/cascader-panel/src/menu.vue
@@ -3,9 +3,9 @@
     :key="menuId"
     tag="ul"
     role="menu"
-    class="el-cascader-menu"
-    wrap-class="el-cascader-menu__wrap"
-    :view-class="['el-cascader-menu__list', isEmpty && 'is-empty']"
+    :class="ns.b()"
+    :wrap-class="ns.e('wrap')"
+    :view-class="[ns.e('list'), ns.is('empty', isEmpty)]"
     @mousemove="handleMouseMove"
     @mouseleave="clearHoverZone"
   >
@@ -16,19 +16,19 @@
       :menu-id="menuId"
       @expand="handleExpand"
     />
-    <div v-if="isLoading" class="el-cascader-menu__empty-text">
-      <el-icon size="14" class="is-loading">
+    <div v-if="isLoading" :class="ns.e('empty-text')">
+      <el-icon size="14" :class="ns.is('loading')">
         <loading />
       </el-icon>
       {{ t('el.cascader.loading') }}
     </div>
-    <div v-else-if="isEmpty" class="el-cascader-menu__empty-text">
+    <div v-else-if="isEmpty" :class="ns.e('empty-text')">
       {{ t('el.cascader.noData') }}
     </div>
     <svg
       v-else-if="panel?.isHoverMenu"
       ref="hoverZone"
-      class="el-cascader-menu__hover-zone"
+      :class="ns.e('hover-zone')"
     ></svg>
   </el-scrollbar>
 </template>
@@ -36,7 +36,7 @@
 <script lang="ts">
 import { computed, defineComponent, getCurrentInstance, inject, ref } from 'vue'
 import ElScrollbar from '@element-plus/components/scrollbar'
-import { useLocale } from '@element-plus/hooks'
+import { useLocale, useNamespace } from '@element-plus/hooks'
 import { generateId } from '@element-plus/utils'
 import { Loading } from '@element-plus/icons-vue'
 import ElIcon from '@element-plus/components/icon'
@@ -70,6 +70,8 @@ export default defineComponent({
 
   setup(props) {
     const instance = getCurrentInstance()!
+    const ns = useNamespace('cascader-menu')
+
     const { t } = useLocale()
     const id = generateId()
     let activeNode: Nullable<HTMLElement> = null
@@ -124,6 +126,7 @@ export default defineComponent({
       clearHoverTimer()
     }
     return {
+      ns,
       panel,
       hoverZone,
       isEmpty,
diff --git a/packages/components/cascader-panel/src/node-content.ts b/packages/components/cascader-panel/src/node-content.ts
index 8d5a99ce0d..8adf657e8f 100644
--- a/packages/components/cascader-panel/src/node-content.ts
+++ b/packages/components/cascader-panel/src/node-content.ts
@@ -1,14 +1,21 @@
 import { defineComponent, h } from 'vue'
-
+import { useNamespace } from '@element-plus/hooks'
 export default defineComponent({
   name: 'NodeContent',
+  setup() {
+    const ns = useNamespace('cascader-node')
+    return {
+      ns,
+    }
+  },
   render() {
+    const { ns } = this
     const { node, panel } = this.$parent
     const { data, label } = node
     const { renderLabelFn } = panel
     return h(
       'span',
-      { class: 'el-cascader-node__label' },
+      { class: ns.e('label') },
       renderLabelFn ? renderLabelFn({ node, data }) : label
     )
   },
diff --git a/packages/components/cascader-panel/src/node.vue b/packages/components/cascader-panel/src/node.vue
index 50e7d482a7..32ef88df73 100644
--- a/packages/components/cascader-panel/src/node.vue
+++ b/packages/components/cascader-panel/src/node.vue
@@ -7,12 +7,12 @@
     :aria-expanded="inExpandingPath"
     :tabindex="expandable ? -1 : undefined"
     :class="[
-      'el-cascader-node',
-      checkStrictly && 'is-selectable',
+      ns.b(),
+      ns.is('selectable', checkStrictly),
+      ns.is('active', node.checked),
+      ns.is('disabled', !expandable),
       inExpandingPath && 'in-active-path',
       inCheckedPath && 'in-checked-path',
-      node.checked && 'is-active',
-      !expandable && 'is-disabled',
     ]"
     @mouseenter="handleHoverExpand"
     @focus="handleHoverExpand"
@@ -41,10 +41,7 @@
       -->
       <span></span>
     </el-radio>
-    <el-icon
-      v-else-if="isLeaf && node.checked"
-      class="el-cascader-node__prefix"
-    >
+    <el-icon v-else-if="isLeaf && node.checked" :class="ns.e('prefix')">
       <check />
     </el-icon>
 
@@ -53,10 +50,10 @@
 
     <!-- postfix -->
     <template v-if="!isLeaf">
-      <el-icon v-if="node.loading" class="is-loading el-cascader-node__postfix">
+      <el-icon v-if="node.loading" :class="[ns.is('loading'), ns.e('postfix')]">
         <loading />
       </el-icon>
-      <el-icon v-else class="arrow-right el-cascader-node__postfix">
+      <el-icon v-else :class="['arrow-right', ns.e('postfix')]">
         <arrow-right />
       </el-icon>
     </template>
@@ -68,6 +65,7 @@ import { computed, defineComponent, inject } from 'vue'
 import ElCheckbox from '@element-plus/components/checkbox'
 import ElRadio from '@element-plus/components/radio'
 import ElIcon from '@element-plus/components/icon'
+import { useNamespace } from '@element-plus/hooks'
 import { Check, Loading, ArrowRight } from '@element-plus/icons-vue'
 import NodeContent from './node-content'
 import { CASCADER_PANEL_INJECTION_KEY } from './types'
@@ -101,6 +99,7 @@ export default defineComponent({
   setup(props, { emit }) {
     const panel = inject(CASCADER_PANEL_INJECTION_KEY)!
 
+    const ns = useNamespace('cascader-node')
     const isHoverMenu = computed(() => panel.isHoverMenu)
     const multiple = computed(() => panel.config.multiple)
     const checkStrictly = computed(() => panel.config.checkStrictly)
@@ -197,6 +196,7 @@ export default defineComponent({
       expandable,
       inExpandingPath,
       inCheckedPath,
+      ns,
       handleHoverExpand,
       handleExpand,
       handleClick,
diff --git a/packages/components/cascader/src/index.vue b/packages/components/cascader/src/index.vue
index b8025205b8..499c233777 100644
--- a/packages/components/cascader/src/index.vue
+++ b/packages/components/cascader/src/index.vue
@@ -3,7 +3,7 @@
     ref="tooltipRef"
     v-model:visible="popperVisible"
     :teleported="compatTeleported"
-    :popper-class="`el-cascader__dropdown ${popperClass}`"
+    :popper-class="[nsCascader.e('dropdown'), popperClass]"
     :popper-options="popperOptions"
     :fallback-placements="[
       'bottom-start',
@@ -16,7 +16,7 @@
     :stop-popper-mouse-event="false"
     :gpu-acceleration="false"
     placement="bottom-start"
-    transition="el-zoom-in-top"
+    :transition="`${nsCascader.namespace.value}-zoom-in-top`"
     effect="light"
     pure
     persistent
@@ -26,9 +26,9 @@
       <div
         v-clickoutside:[popperPaneRef]="() => togglePopperVisible(false)"
         :class="[
-          'el-cascader',
-          realSize && `el-cascader--${realSize}`,
-          { 'is-disabled': isDisabled },
+          nsCascader.b(),
+          nsCascader.m(realSize),
+          nsCascader.is('disabled', isDisabled),
           $attrs.class,
         ]"
         :style="$attrs.style"
@@ -45,7 +45,7 @@
           :disabled="isDisabled"
           :validate-event="false"
           :size="realSize"
-          :class="{ 'is-focus': popperVisible }"
+          :class="nsCascader.is('focus', popperVisible)"
           @compositionstart="handleComposition"
           @compositionupdate="handleComposition"
           @compositionend="handleComposition"
@@ -57,7 +57,7 @@
             <el-icon
               v-if="clearBtnVisible"
               key="clear"
-              class="el-input__icon icon-circle-close"
+              :class="[nsInput.e('icon'), 'icon-circle-close']"
               @click.stop="handleClear"
             >
               <circle-close />
@@ -66,9 +66,9 @@
               v-else
               key="arrow-down"
               :class="[
-                'el-input__icon',
+                nsInput.e('icon'),
                 'icon-arrow-down',
-                popperVisible && 'is-reverse',
+                nsCascader.is('reverse', popperVisible),
               ]"
               @click.stop="togglePopperVisible()"
             >
@@ -77,7 +77,7 @@
           </template>
         </el-input>
 
-        <div v-if="multiple" ref="tagWrapper" class="el-cascader__tags">
+        <div v-if="multiple" ref="tagWrapper" :class="nsCascader.e('tags')">
           <el-tag
             v-for="tag in presentTags"
             :key="tag.key"
@@ -94,7 +94,7 @@
             v-if="filterable && !isDisabled"
             v-model="searchInputValue"
             type="text"
-            class="el-cascader__search-input"
+            :class="nsCascader.e('search-input')"
             :placeholder="presentText ? '' : inputPlaceholder"
             @input="(e) => handleInput(searchInputValue, e)"
             @click.stop="togglePopperVisible(true)"
@@ -124,8 +124,8 @@
         v-show="filtering"
         ref="suggestionPanel"
         tag="ul"
-        class="el-cascader__suggestion-panel"
-        view-class="el-cascader__suggestion-list"
+        :class="nsCascader.e('suggestion-panel')"
+        :view-class="nsCascader.e('suggestion-list')"
         @keydown="handleSuggestionKeyDown"
       >
         <template v-if="suggestions.length">
@@ -133,8 +133,8 @@
             v-for="item in suggestions"
             :key="item.uid"
             :class="[
-              'el-cascader__suggestion-item',
-              item.checked && 'is-checked',
+              nsCascader.e('suggestion-item'),
+              nsCascader.is('checked', item.checked),
             ]"
             :tabindex="-1"
             @click="handleSuggestionClick(item)"
@@ -144,7 +144,7 @@
           </li>
         </template>
         <slot v-else name="empty">
-          <li class="el-cascader__empty-text">
+          <li :class="nsCascader.e('empty-text')">
             {{ t('el.cascader.noMatch') }}
           </li>
         </slot>
@@ -182,7 +182,7 @@ import ElIcon from '@element-plus/components/icon'
 
 import { formContextKey, formItemContextKey } from '@element-plus/tokens'
 import { ClickOutside as Clickoutside } from '@element-plus/directives'
-import { useLocale, useSize } from '@element-plus/hooks'
+import { useLocale, useSize, useNamespace } from '@element-plus/hooks'
 
 import {
   focusNode,
@@ -323,6 +323,9 @@ export default defineComponent({
       COMPONENT_NAME,
       'popperAppendToBody'
     )
+    const nsCascader = useNamespace('cascader')
+    const nsInput = useNamespace('input')
+
     const { t } = useLocale()
     const elForm = inject(formContextKey, {} as FormContext)
     const elFormItem = inject(formItemContextKey, {} as FormItemContext)
@@ -497,11 +500,11 @@ export default defineComponent({
 
       if (filtering.value && suggestionPanel.value) {
         firstNode = suggestionPanel.value.$el.querySelector(
-          '.el-cascader__suggestion-item'
+          `.${nsCascader.e('suggestion-item')}`
         )
       } else {
         firstNode = panel.value?.$el.querySelector(
-          '.el-cascader-node[tabindex="-1"]'
+          `.${nsCascader.b('node')}[tabindex="-1"]`
         )
       }
 
@@ -520,7 +523,7 @@ export default defineComponent({
 
       if (suggestionPanelEl) {
         const suggestionList = suggestionPanelEl.querySelector(
-          '.el-cascader__suggestion-list'
+          `.${nsCascader.e('suggestion-list')}`
         )
         suggestionList.style.minWidth = `${inputInner.offsetWidth}px`
       }
@@ -603,7 +606,7 @@ export default defineComponent({
             getSibling(
               target,
               distance,
-              '.el-cascader__suggestion-item[tabindex="-1"]'
+              `.${nsCascader.e('suggestion-item')}[tabindex="-1"]`
             )
           )
           break
@@ -709,6 +712,8 @@ export default defineComponent({
       // deprecation in ver 2.1.0
       compatTeleported,
 
+      nsCascader,
+      nsInput,
       t,
       togglePopperVisible,
       hideSuggestionPanel,