diff --git a/demo/documentation/components/dynamic-input/enUS/form.demo.md b/demo/documentation/components/dynamic-input/enUS/form.demo.md
index 379dc1df8..3360b0e74 100644
--- a/demo/documentation/components/dynamic-input/enUS/form.demo.md
+++ b/demo/documentation/components/dynamic-input/enUS/form.demo.md
@@ -29,7 +29,7 @@
         >
           <n-input
             placeholder="Name"
-            @keydown.enter.native.prevent
+            @keydown.enter.prevent
             v-model="model.dynamicInputValue[index].name"
           />
           <!--
@@ -44,7 +44,7 @@
         >
           <n-input
             placeholder="Value"
-            @keydown.enter.native.prevent
+            @keydown.enter.prevent
             v-model="model.dynamicInputValue[index].value"
           />
         </n-form-item>
diff --git a/demo/documentation/components/dynamic-input/zhCN/form.demo.md b/demo/documentation/components/dynamic-input/zhCN/form.demo.md
index 0cbb592d3..480bf836d 100644
--- a/demo/documentation/components/dynamic-input/zhCN/form.demo.md
+++ b/demo/documentation/components/dynamic-input/zhCN/form.demo.md
@@ -26,7 +26,7 @@
         >
           <n-input
             placeholder="Name"
-            @keydown.enter.native.prevent
+            @keydown.enter.prevent
             v-model="model.dynamicInputValue[index].name"
           />
           <!--
@@ -41,7 +41,7 @@
         >
           <n-input
             placeholder="Value"
-            @keydown.enter.native.prevent
+            @keydown.enter.prevent
             v-model="model.dynamicInputValue[index].value"
           />
         </n-form-item>
diff --git a/demo/documentation/components/form/enUS/custom-rule.demo.md b/demo/documentation/components/form/enUS/custom-rule.demo.md
index 5c1a1e4b8..1a8e9e7ee 100644
--- a/demo/documentation/components/form/enUS/custom-rule.demo.md
+++ b/demo/documentation/components/form/enUS/custom-rule.demo.md
@@ -12,7 +12,7 @@ Sometimes builtin triggers don't meet you demand. You can custom you valiation b
   >
     <n-input
       v-model="model.age"
-      @keydown.enter.native.prevent
+      @keydown.enter.prevent
     />
   </n-form-item-row>
   <n-form-item-row
@@ -23,7 +23,7 @@ Sometimes builtin triggers don't meet you demand. You can custom you valiation b
       v-model="model.password"
       @input="handlePasswordInput"
       type="password"
-      @keydown.enter.native.prevent
+      @keydown.enter.prevent
     />
   </n-form-item-row>
   <n-form-item-row
@@ -36,7 +36,7 @@ Sometimes builtin triggers don't meet you demand. You can custom you valiation b
       :disabled="!model.password"
       v-model="model.reenteredPassword"
       type="password"
-      @keydown.enter.native.prevent
+      @keydown.enter.prevent
     />
   </n-form-item-row>
   <n-row :gutter="[0, 24]">
diff --git a/demo/documentation/components/form/zhCN/async.demo.md b/demo/documentation/components/form/zhCN/async.demo.md
index 80a0a160c..b4b466561 100644
--- a/demo/documentation/components/form/zhCN/async.demo.md
+++ b/demo/documentation/components/form/zhCN/async.demo.md
@@ -11,25 +11,25 @@
     label="Name"
     path="user.name"
   >
-    <n-input v-model="formValue.user.name" placeholder="Input Name" />
+    <n-input v-model:value="formValue.user.name" placeholder="Input Name" />
   </n-form-item>
   <n-form-item
     label="Age"
     path="user.age"
   >
-    <n-input placeholder="Input Age" v-model="formValue.user.age"/>
+    <n-input placeholder="Input Age" v-model:value="formValue.user.age"/>
   </n-form-item>
   <n-form-item
     label="Adress"
     path="user.address"
   >
-    <n-input placeholder="Input Address" v-model="formValue.user.address"/>
+    <n-input placeholder="Input Address" v-model:value="formValue.user.address"/>
   </n-form-item>
   <n-form-item
     label="Phone"
     path="phone"
   >
-    <n-input placeholder="Phone Number" v-model="formValue.phone"/>
+    <n-input placeholder="Phone Number" v-model:value="formValue.phone"/>
   </n-form-item>
   <n-form-item>
     <n-button @click="handleValidateClick">Validate</n-button>
@@ -42,6 +42,7 @@
 ```
 ```js
 export default {
+  inject: ['message'],
   data () {
     return {
       formValue: {
@@ -98,13 +99,12 @@ export default {
       e.preventDefault()
       this.$refs.form.validate(errors => {
         if (!errors) {
-          this.$NMessage.success('Valid')
+          this.message.success('Valid')
         } else {
-          this.$NMessage.error('Invalid')
+          this.message.error('Invalid')
           console.log('errors', errors)
         }
       })
-      console.log('end')
     }
   }
 }
diff --git a/demo/documentation/components/form/zhCN/custom-rule.demo.md b/demo/documentation/components/form/zhCN/custom-rule.demo.md
index d07243bbc..9e8343f77 100644
--- a/demo/documentation/components/form/zhCN/custom-rule.demo.md
+++ b/demo/documentation/components/form/zhCN/custom-rule.demo.md
@@ -11,8 +11,8 @@
     label="年龄"
   >
     <n-input
-      v-model="model.age"
-      @keydown.enter.native.prevent
+      v-model:value="model.age"
+      @keydown.enter.prevent
     />
   </n-form-item-row>
   <n-form-item-row
@@ -20,10 +20,10 @@
     label="密码"
   >
     <n-input
-      v-model="model.password"
+      v-model:value="model.password"
       @input="handlePasswordInput"
       type="password"
-      @keydown.enter.native.prevent
+      @keydown.enter.prevent
     />
   </n-form-item-row>
   <n-form-item-row
@@ -34,9 +34,9 @@
   >
     <n-input
       :disabled="!model.password"
-      v-model="model.reenteredPassword"
+      v-model:value="model.reenteredPassword"
       type="password"
-      @keydown.enter.native.prevent
+      @keydown.enter.prevent
     />
   </n-form-item-row>
   <n-row :gutter="[0, 24]">
diff --git a/demo/documentation/components/form/zhCN/custom-validation.demo.md b/demo/documentation/components/form/zhCN/custom-validation.demo.md
index f5b11334b..290975c5c 100644
--- a/demo/documentation/components/form/zhCN/custom-validation.demo.md
+++ b/demo/documentation/components/form/zhCN/custom-validation.demo.md
@@ -8,7 +8,7 @@
     :feedback="inputFeedback"
   >
     <n-input
-      v-model="inputValue"
+      v-model:value="inputValue"
       clearable
     />
   </n-form-item>
@@ -18,7 +18,7 @@
     :feedback="inputNumberFeedback"
   >
     <n-input-number
-      v-model="inputNumberValue"
+      v-model:value="inputNumberValue"
     />
   </n-form-item>
   <n-form-item
@@ -27,8 +27,7 @@
     :feedback="selectFeedback"
   >
     <n-select
-      debug
-      v-model="selectValue"
+      v-model:value="selectValue"
       :options="selectOptions"
       clearable
     />
diff --git a/demo/documentation/components/form/zhCN/index.demo-entry.md b/demo/documentation/components/form/zhCN/index.demo-entry.md
index 017031ab6..c6fe20125 100644
--- a/demo/documentation/components/form/zhCN/index.demo-entry.md
+++ b/demo/documentation/components/form/zhCN/index.demo-entry.md
@@ -34,7 +34,7 @@ validator-debug
 |trigger|`string \| Array<string>`||
 |message|`string`||
 
-### Form Item Props
+### FormItem Props
 |名称|类型|默认值|说明|
 |-|-|-|-|
 |feedback|`string`|`null`|表项的反馈信息。不设为 `null` 时，会覆盖规则验证的结果|
@@ -46,17 +46,16 @@ validator-debug
 |label-style|`Object`|`{}`||
 |label-width|`number \| string`|`null`|如果没有被设定，使用外层表单的 `label-width`|
 |path|`string`|`null`|将值收集到外层表单 `model` 对象的路径|
-|required|`boolean`|`false`|是否展示必填的星号。注意：一个 `required: true` 的规则比这个属性有更高的优先级 & 这个属性不会影响表单的验证。验证完全依赖于规则|
 |rule|`FormItemRule \| Array<FormItemRule>`|`null`|验证表项的规则，它会被通过 `rule-path` 从外层表单获取的规则合并来作为表项的验证规则。推荐还是在外层表单设置所有规则|
 |rule-path|`string`|`null`|从外层表单的 `rules` 对象获取规则的路径。如果没有设定，使用表项的 `path` 代替|
-|show-require-mark|`boolean`|`true`|在表项是必填的时候是不是展示星号。如果没有被设定，使用外层 `n-form` 的 `show-require-mark`|
+|show-require-mark|`boolean`|`true`|是否展示必填的星号。如果没有被设定，使用外层 `n-form` 的 `show-require-mark`|
 |size|`'small' \| 'medium' \| 'large'`|`'medium'`||
 |validation-status|`'error' \| 'success' \| 'warning' \| null`|`null`|表单的验证状态。不设为 `null`时，会覆盖规则验证的结果|
 
-### Form Item Row Props
-接受 Form Item & [Row](n-row#Row-Props) 所有的 Props。
-### Form Item Col Props
-接受 Form Item & [Col](n-row#Col-Props) 所有的 Props。
+### FormItemRow Props
+接受 FormItem & [Row](n-row#Row-Props) 所有的 Props。
+### FormItemCol Props
+接受 FormItem & [Col](n-row#Col-Props) 所有的 Props。
 
 ## Methods
 ### Form Methods
@@ -72,7 +71,7 @@ validator-debug
 |validate|`(validateCallback?: (errors?: Array<ValidationError>) => any, shouldRuleBeApplied?: FormItemRule => boolean) => Promise<void>`|验证表单。Promise rejection 的返回值类型是 `Array<ValidationError>`。|
 |clearValidationEffect|`() => void`||
 
-### Form Item, Form Item Row, Form Item Col Methods
+### FormItem, FormItemRow, FormItemCol Methods
 |名称|类型|说明|
 |-|-|-|
 |validate|`(options: { trigger?: string, callback?: (errors?: Array<ValidationError>) => any, shouldRuleBeApplied?: FormItemRule => boolean, options?: AsyncValidatorOptions }) => Promise<void>`|验证表项，Promise rejection 的返回值类型是 `Array<ValidationError>`。如果设定 `trigger`，这一个表项全部的规则都会被使用。`shouldRuleBeApplied` 可以用来进一步过滤已经经过 `trigger` 筛选的规则|
@@ -81,12 +80,12 @@ validator-debug
 关于 AsyncValidatorOptions，参考 <n-a href="https://github.com/yiminghe/async-validator">async-validator</n-a>。
 
 ## Slots
-### Form, Form Item, Form Item Row, Form Item Col Slots
+### Form, FormItem, FormItemRow, FormItemCol Slots
 |名称|参数|说明|
 |-|-|-|
 |default|`()`||
 
-### Form Item, Form Item Row, Form Item Col Slots
+### FormItem, FormItem Row, FormItemCol Slots
 |名称|参数|说明|
 |-|-|-|
 |label|`()`||
\ No newline at end of file
diff --git a/demo/documentation/components/form/zhCN/left.demo.md b/demo/documentation/components/form/zhCN/left.demo.md
index 1492077de..e21e87f98 100644
--- a/demo/documentation/components/form/zhCN/left.demo.md
+++ b/demo/documentation/components/form/zhCN/left.demo.md
@@ -1,6 +1,6 @@
 # 标签左置
 ```html
-<n-radio-group v-model="size" name="left-size" style="margin-bottom: 12px;">
+<n-radio-group v-model:value="size" name="left-size" style="margin-bottom: 12px;">
   <n-radio-button value="small">小</n-radio-button>
   <n-radio-button value="medium" >中</n-radio-button>
   <n-radio-button value="large">大</n-radio-button>
@@ -18,10 +18,10 @@
   }"
 >
   <n-form-item-row label="Input" path="inputValue">
-    <n-input placeholder="Input" v-model="model.inputValue" />
+    <n-input placeholder="Input" v-model:value="model.inputValue" />
   </n-form-item-row>
   <n-form-item-row label="Textarea" path="textareaValue">
-    <n-input placeholder="Textarea" v-model="model.textareaValue" type="textarea"
+    <n-input placeholder="Textarea" v-model:value="model.textareaValue" type="textarea"
       :autosize="{
         minRows: 3,
         maxRows: 5
@@ -29,60 +29,60 @@
     />
   </n-form-item-row>
   <n-form-item-row label="Select" path="selectValue">
-    <n-select placeholder="Select" :options="generalOptions" v-model="model.selectValue"/>
+    <n-select placeholder="Select" :options="generalOptions" v-model:value="model.selectValue"/>
   </n-form-item-row>
   <n-form-item-row label="Multiple Select" path="multipleSelectValue">
-    <n-select placeholder="Select" :options="generalOptions" v-model="model.multipleSelectValue" multiple/>
+    <n-select placeholder="Select" :options="generalOptions" v-model:value="model.multipleSelectValue" multiple/>
   </n-form-item-row>
   <n-form-item-row label="Datetime" path="datetimeValue">
-    <n-date-picker type="datetime" v-model="model.datetimeValue"/>
+    <n-date-picker type="datetime" v-model:value="model.datetimeValue"/>
   </n-form-item-row>
   <n-form-item-row label="Switch" path="switchValue">
-    <n-switch v-model="model.switchValue" />
+    <n-switch v-model:value="model.switchValue" />
   </n-form-item-row>
   <n-form-item-row label="Checkbox Group" path="checkboxGroupValue">
-    <n-checkbox-group v-model="model.checkboxGroupValue">
+    <n-checkbox-group v-model:value="model.checkboxGroupValue">
       <n-checkbox value="Option 1">Option 1</n-checkbox>
       <n-checkbox value="Option 2">Option 2</n-checkbox>
       <n-checkbox value="Option 3">Option 3</n-checkbox>
     </n-checkbox-group>
   </n-form-item-row>
   <n-form-item-row label="Radio Group" path="radioGroupValue">
-    <n-radio-group v-model="model.radioGroupValue" name="radiogroup1">
+    <n-radio-group v-model:value="model.radioGroupValue" name="radiogroup1">
       <n-radio value="Radio 1">Radio 1</n-radio>
       <n-radio value="Radio 2">Radio 2</n-radio>
       <n-radio value="Radio 3">Radio 3</n-radio>
     </n-radio-group>
   </n-form-item-row>
   <n-form-item-row label="Radio Button Group" path="radioGroupValue">
-    <n-radio-group v-model="model.radioGroupValue" name="radiogroup2">
+    <n-radio-group v-model:value="model.radioGroupValue" name="radiogroup2">
       <n-radio-button value="Radio 1">Radio 1</n-radio-button>
       <n-radio-button value="Radio 2">Radio 2</n-radio-button>
       <n-radio-button value="Radio 3">Radio 3</n-radio-button>
     </n-radio-group>
   </n-form-item-row>
   <n-form-item-row label="Input Number" path="inputNumberValue">
-    <n-input-number v-model="model.inputNumberValue"/>
+    <n-input-number v-model:value="model.inputNumberValue"/>
   </n-form-item-row>
   <n-form-item-row label="Time Picker" path="timePickerValue">
-    <n-time-picker v-model="model.timePickerValue" />
+    <n-time-picker v-model:value="model.timePickerValue" />
   </n-form-item-row>
   <n-form-item-row label="Slider" path="sliderValue">
-    <n-slider v-model="model.sliderValue" :step="5"/>
+    <n-slider v-model:value="model.sliderValue" :step="5"/>
   </n-form-item-row>
   <n-form-item-row label="Transfer" path="transferValue">
     <n-transfer
-      v-model="model.transferValue"
+      v-model:value="model.transferValue"
       :options="generalOptions"
     />
   </n-form-item-row>
   <n-form-item-row  :gutter="[28, 0]" label="Nested Path">
     <n-row :gutter="[28, 0]" >
       <n-form-item-col :span="12" path="nestedValue.path1">
-        <n-input placeholder="Nested Path 1" v-model="model.nestedValue.path1"/>
+        <n-input placeholder="Nested Path 1" v-model:value="model.nestedValue.path1"/>
       </n-form-item-col>
       <n-form-item-col :span="12" path="nestedValue.path2">
-        <n-select placeholder="Nested Path 2" :options="generalOptions" v-model="model.nestedValue.path2"/>
+        <n-select placeholder="Nested Path 2" :options="generalOptions" v-model:value="model.nestedValue.path2"/>
       </n-form-item-col>
     </n-row>
   </n-form-item-row>
@@ -102,6 +102,7 @@
 
 ```js
 export default {
+  inject: ['message'],
   data () {
     return {
       size: 'medium',
@@ -216,10 +217,10 @@ export default {
       e.preventDefault()
       this.$refs.form.validate(errors => {
         if (!errors) {
-          this.$NMessage.success('验证成功')
+          this.message.success('验证成功')
         } else {
           console.log(errors)
-          this.$NMessage.error('验证失败')
+          this.message.error('验证失败')
         }
       })
     }
diff --git a/demo/documentation/components/form/zhCN/top.demo.md b/demo/documentation/components/form/zhCN/top.demo.md
index 549646895..0f972a2d7 100644
--- a/demo/documentation/components/form/zhCN/top.demo.md
+++ b/demo/documentation/components/form/zhCN/top.demo.md
@@ -1,6 +1,6 @@
 # 标签上置
 ```html
-<n-radio-group v-model="size" name="top-size" style="margin-bottom: 12px;">
+<n-radio-group v-model:value="size" name="top-size" style="margin-bottom: 12px;">
   <n-radio-button value="small">小</n-radio-button>
   <n-radio-button value="medium" >中</n-radio-button>
   <n-radio-button value="large">大</n-radio-button>
@@ -14,10 +14,10 @@
 >
   <n-row :gutter="24">
     <n-form-item-col :span="12" label="Input" path="inputValue">
-      <n-input placeholder="Input" v-model="model.inputValue" />
+      <n-input placeholder="Input" v-model:value="model.inputValue" />
     </n-form-item-col>
     <n-form-item-col :span="12" label="Textarea" path="textareaValue">
-      <n-input placeholder="Textarea" v-model="model.textareaValue" type="textarea"
+      <n-input placeholder="Textarea" v-model:value="model.textareaValue" type="textarea"
         :autosize="{
           minRows: 3,
           maxRows: 5
@@ -27,30 +27,30 @@
   </n-row>
   <n-row :gutter="24">
     <n-form-item-col :span="12" label="Select" path="selectValue">
-      <n-select placeholder="Select" :options="generalOptions" v-model="model.selectValue"/>
+      <n-select placeholder="Select" :options="generalOptions" v-model:value="model.selectValue"/>
     </n-form-item-col>
     <n-form-item-col :span="12" label="Multiple Select" path="multipleSelectValue">
-      <n-select placeholder="Select" :options="generalOptions" v-model="model.multipleSelectValue" multiple/>
+      <n-select placeholder="Select" :options="generalOptions" v-model:value="model.multipleSelectValue" multiple/>
     </n-form-item-col>
   </n-row>
   <n-row :gutter="24">
     <n-form-item-col :span="12" label="Datetime" path="datetimeValue">
-      <n-date-picker type="datetime" v-model="model.datetimeValue"/>
+      <n-date-picker type="datetime" v-model:value="model.datetimeValue"/>
     </n-form-item-col>
     <n-form-item-col :span="12" label="Switch" path="switchValue">
-      <n-switch v-model="model.switchValue" />
+      <n-switch v-model:value="model.switchValue" />
     </n-form-item-col>
   </n-row>
   <n-row :gutter="24">
     <n-form-item-col :span="12" label="Checkbox Group" path="checkboxGroupValue">
-      <n-checkbox-group v-model="model.checkboxGroupValue">
+      <n-checkbox-group v-model:value="model.checkboxGroupValue">
         <n-checkbox value="Option 1">Option 1</n-checkbox>
         <n-checkbox value="Option 2">Option 2</n-checkbox>
         <n-checkbox value="Option 3">Option 3</n-checkbox>
       </n-checkbox-group>
     </n-form-item-col>
     <n-form-item-col :span="12" label="Radio Group" path="radioGroupValue">
-      <n-radio-group v-model="model.radioGroupValue" name="radiogroup1">
+      <n-radio-group v-model:value="model.radioGroupValue" name="radiogroup1">
         <n-radio value="Radio 1">Radio 1</n-radio>
         <n-radio value="Radio 2">Radio 2</n-radio>
         <n-radio value="Radio 3">Radio 3</n-radio>
@@ -59,37 +59,37 @@
   </n-row>
   <n-row :gutter="24">
     <n-form-item-col :span="12" label="Radio Button Group" path="radioGroupValue">
-      <n-radio-group v-model="model.radioGroupValue" name="radiogroup2">
+      <n-radio-group v-model:value="model.radioGroupValue" name="radiogroup2">
         <n-radio-button value="Radio 1">Radio 1</n-radio-button>
         <n-radio-button value="Radio 2">Radio 2</n-radio-button>
         <n-radio-button value="Radio 3">Radio 3</n-radio-button>
       </n-radio-group>
     </n-form-item-col>
     <n-form-item-col :span="12" label="Input Number" path="inputNumberValue">
-      <n-input-number v-model="model.inputNumberValue"/>
+      <n-input-number v-model:value="model.inputNumberValue"/>
     </n-form-item-col>
   </n-row>
   <n-row :gutter="24">
     <n-form-item-col :span="12" label="Time Picker" path="timePickerValue">
-      <n-time-picker v-model="model.timePickerValue" />
+      <n-time-picker v-model:value="model.timePickerValue" />
     </n-form-item-col>
     <n-form-item-col :span="12" label="Slider" path="sliderValue">
-      <n-slider v-model="model.sliderValue" :step="5"/>
+      <n-slider v-model:value="model.sliderValue" :step="5"/>
     </n-form-item-col>
   </n-row>
   <n-row :gutter="24">
     <n-form-item-col :span="14" label="Transfer" path="transferValue">
       <n-transfer
         style="width: 100%;"
-        v-model="model.transferValue"
+        v-model:value="model.transferValue"
         :options="generalOptions"
       />
     </n-form-item-col>
     <n-form-item-col :span="5" label="Nested Path" path="nestedValue.path1">
-      <n-cascader placeholder="Nested Path 1" v-model="model.nestedValue.path1" :options="cascaderOptions"/>
+      <n-cascader placeholder="Nested Path 1" v-model:value="model.nestedValue.path1" :options="cascaderOptions"/>
     </n-form-item-col>
     <n-form-item-col :span="5" path="nestedValue.path2">
-      <n-select placeholder="Nested Path 2" :options="generalOptions" v-model="model.nestedValue.path2"/>
+      <n-select placeholder="Nested Path 2" :options="generalOptions" v-model:value="model.nestedValue.path2"/>
     </n-form-item-col>
   </n-row>
   <n-row>
diff --git a/demo/routes/router.js b/demo/routes/router.js
index 296864215..c6129090f 100644
--- a/demo/routes/router.js
+++ b/demo/routes/router.js
@@ -9,14 +9,16 @@ export default function createDemoRouter (app, routes) {
   })
 
   router.beforeEach(function (to, from, next) {
-    if (loadingBarApiRef.value) {
-      loadingBarApiRef.value.start()
+    if (!from || to.path !== from.path) {
+      if (loadingBarApiRef.value) {
+        loadingBarApiRef.value.start()
+      }
     }
     next()
   })
 
   router.afterEach(function (to, from) {
-    if (to.path !== from.path) {
+    if (!from || to.path !== from.path) {
       if (loadingBarApiRef.value) {
         loadingBarApiRef.value.finish()
       }
diff --git a/src/_mixins/asformitem.js b/src/_mixins/asformitem.js
index 9249cbb74..0dfb0d40d 100644
--- a/src/_mixins/asformitem.js
+++ b/src/_mixins/asformitem.js
@@ -4,10 +4,8 @@ export default function (options = {}) {
     mergedSize
   } = options
   return {
-    provide () {
-      return {
-        NFormItem: null
-      }
+    provide: {
+      NFormItem: null
     },
     inject: {
       NFormItem: {
diff --git a/src/checkbox/src/Checkbox.vue b/src/checkbox/src/Checkbox.vue
index 7180abd17..9a8abd858 100644
--- a/src/checkbox/src/Checkbox.vue
+++ b/src/checkbox/src/Checkbox.vue
@@ -95,6 +95,7 @@ export default {
         ) {
           return NFormItem.mergedSize
         }
+        return 'medium'
       }
     }),
     usecssr(styles)
@@ -104,7 +105,7 @@ export default {
       validator (value) {
         return ['small', 'medium', 'large'].includes(value)
       },
-      default: null
+      default: undefined
     },
     value: {
       type: [Number, Boolean, String],
diff --git a/src/checkbox/src/CheckboxGroup.js b/src/checkbox/src/CheckboxGroup.js
index 31516ba0f..43dd7c21c 100644
--- a/src/checkbox/src/CheckboxGroup.js
+++ b/src/checkbox/src/CheckboxGroup.js
@@ -22,7 +22,7 @@ export default {
       validator (value) {
         return ['small', 'medium', 'large'].includes(value)
       },
-      default: null
+      default: undefined
     },
     value: {
       type: Array,
diff --git a/src/form/src/Form.vue b/src/form/src/Form.vue
index 7b68dbb5f..e63442d7d 100644
--- a/src/form/src/Form.vue
+++ b/src/form/src/Form.vue
@@ -45,16 +45,20 @@ export default {
       type: Object,
       default: undefined
     },
-    showRequireMark: {
-      type: Boolean,
-      default: undefined
-    },
     size: {
       validator (value) {
         return ['small', 'medium', 'large'].includes(value)
       },
       default: undefined
     },
+    showRequireMark: {
+      type: Boolean,
+      default: undefined
+    },
+    showFeedback: {
+      type: Boolean,
+      default: true
+    },
     onSubmit: {
       type: Function,
       default: e => e.preventDefault()
diff --git a/src/form/src/FormItem.vue b/src/form/src/FormItem.vue
index 4013e7e10..add94281e 100644
--- a/src/form/src/FormItem.vue
+++ b/src/form/src/FormItem.vue
@@ -32,16 +32,17 @@
         <slot />
       </div>
       <div
-        v-if="mergedValidationStatus !== undefined || path"
+        v-if="mergedShowFeedback"
+        :key="feedbackId"
         class="n-form-item-feedback-wrapper"
       >
         <transition
           name="n-form-item-feedback-transition"
-          @before-enter="handleBeforeEnter"
-          @before-leave="handleBeforeLeave"
-          @after-leave="handleAfterLeave"
         >
-          <div v-if="feedback !== undefined" class="n-form-item-feedback">
+          <div
+            v-if="feedback !== undefined && feedback !== null"
+            class="n-form-item-feedback"
+          >
             {{ feedback }}
           </div>
           <div v-else-if="explains.length" class="n-form-item-feedback">
@@ -68,6 +69,7 @@ import {
 } from '../../_mixins'
 import styles from './styles'
 import { warn } from '../../_utils/naive'
+import { createId } from '../../_utils/vue'
 import {
   formItemMisc,
   formItemSize,
@@ -158,6 +160,10 @@ export default {
       type: Boolean,
       default: undefined
     },
+    showFeedback: {
+      type: Boolean,
+      default: undefined
+    },
     rule: {
       type: [Object, Array],
       default: undefined
@@ -186,9 +192,6 @@ export default {
   inject: {
     NForm: {
       default: null
-    },
-    NFormItem: {
-      default: null
     }
   },
   provide () {
@@ -206,7 +209,7 @@ export default {
   data () {
     return {
       explains: [],
-      feedbackTransitionDisabled: true
+      feedbackId: createId()
     }
   },
   watch: {
@@ -215,28 +218,11 @@ export default {
       this.restoreValidation()
     }
   },
-  mounted () {
-    this.feedbackTransitionDisabled = false
-  },
   methods: {
     restoreValidation () {
       this.explains = []
       this.validationErrored = false
-      this.disableFeedbackTransition()
-    },
-    handleBeforeLeave (feedback) {
-      if (this.feedbackTransitionDisabled) {
-        if (feedback) {
-          feedback.style.transition = 'none'
-        }
-      } else {
-        if (feedback) {
-          feedback.style.transition = null
-        }
-      }
-    },
-    disableFeedbackTransition () {
-      this.feedbackTransitionDisabled = true
+      this.feedbackId = createId()
     },
     handleContentBlur () {
       this._validate('blur')
@@ -295,9 +281,6 @@ export default {
        * be valid.
        */
       if (!path) {
-        if (__DEV__) {
-          warn('form-item', '`n-form-item` without `path` can\'t be validated.')
-        }
         return Promise.resolve({
           valid: true
         })
@@ -357,12 +340,6 @@ export default {
     clearValidationEffect () {
       this.explains = []
       this.validationErrored = false
-    },
-    handleBeforeEnter () {
-      this.feedbackTransitionDisabled = false
-    },
-    handleAfterLeave () {
-      this.feedbackTransitionDisabled = false
     }
   }
 }
diff --git a/src/form/src/utils.js b/src/form/src/utils.js
index db05824b8..78af2283b 100644
--- a/src/form/src/utils.js
+++ b/src/form/src/utils.js
@@ -70,13 +70,22 @@ export function formItemMisc (props) {
     if (validationErroredRef.value) return 'error'
     return undefined
   })
+  const mergedShowFeedbackRef = computed(() => {
+    const {
+      showFeedback
+    } = props
+    if (showFeedback) return showFeedback
+    if (NForm && NForm.showFeedback) return NForm.showFeedback
+    return true
+  })
   return {
     validationErrored: validationErroredRef,
     mergedLabelStyle: mergedLabelStyleRef,
     mergedLabelPlacement: mergedLabelPlacementRef,
     mergedLabelAlign: mergedLabelAlignRef,
     mergedShowRequireMark: mergedShowRequireMarkRef,
-    mergedValidationStatus: mergedValidationStatusRef
+    mergedValidationStatus: mergedValidationStatusRef,
+    mergedShowFeedback: mergedShowFeedbackRef
   }
 }
 
diff --git a/src/input-number/src/InputNumber.vue b/src/input-number/src/InputNumber.vue
index dcc25d0d0..ae6054367 100644
--- a/src/input-number/src/InputNumber.vue
+++ b/src/input-number/src/InputNumber.vue
@@ -63,10 +63,12 @@
 import NIcon from '../../icon/index'
 import RemoveIcon from '../../_icons/remove-outline.vue'
 import AddIcon from '../../_icons/add-outline.vue'
-import themeable from '../../_mixins/themeable'
-import withapp from '../../_mixins/withapp'
-import asformitem from '../../_mixins/asformitem'
-import usecssr from '../../_mixins/usecssr'
+import {
+  configurable,
+  themeable,
+  asformitem,
+  usecssr
+} from '../../_mixins'
 import { warn } from '../../_utils/naive/warn'
 import styles from './styles'
 
@@ -93,16 +95,11 @@ export default {
     AddIcon
   },
   mixins: [
-    withapp,
+    configurable,
     themeable,
     asformitem(),
     usecssr(styles)
   ],
-  inject: {
-    NFormItem: {
-      default: null
-    }
-  },
   props: {
     placeholder: {
       type: String,
diff --git a/src/radio/src/Radio.vue b/src/radio/src/Radio.vue
index 82e53cea9..08ab15a99 100644
--- a/src/radio/src/Radio.vue
+++ b/src/radio/src/Radio.vue
@@ -68,6 +68,7 @@ export default {
         ) {
           return NFormItem.mergedSize
         }
+        return 'medium'
       }
     }),
     radioMixin
diff --git a/src/switch/src/Switch.vue b/src/switch/src/Switch.vue
index 51037cbf3..4511162f1 100644
--- a/src/switch/src/Switch.vue
+++ b/src/switch/src/Switch.vue
@@ -6,6 +6,8 @@
     }"
     :tabindex="!disabled ? 0 : false"
     @click="handleClick"
+    @focus="handleFocus"
+    @blur="handleBlur"
   >
     <div
       class="n-switch__rail"
@@ -18,25 +20,28 @@
 </template>
 
 <script>
-import withapp from '../../_mixins/withapp'
-import themeable from '../../_mixins/themeable'
-import asformitem from '../../_mixins/asformitem'
-import usecssr from '../../_mixins/usecssr'
+import {
+  configurable,
+  themeable,
+  asformitem,
+  usecssr
+} from '../../_mixins'
+import {
+  call
+} from '../../_utils/vue'
+import {
+  warn
+} from '../../_utils/naive'
 import styles from './styles'
 
 export default {
   cssrName: 'Switch',
   mixins: [
-    withapp,
+    configurable,
     themeable,
     asformitem(),
     usecssr(styles)
   ],
-  inject: {
-    NFormItem: {
-      default: null
-    }
-  },
   props: {
     value: {
       type: Boolean,
@@ -48,17 +53,56 @@ export default {
     },
     // eslint-disable-next-line vue/prop-name-casing
     'onUpdate:value': {
-      type: Function,
-      default: () => {}
+      type: [Function, Array],
+      default: undefined
+    },
+    onChange: {
+      validator () {
+        if (__DEV__) warn('switch', '`on-change` is deprecated, please use `on-update:value` instead.')
+        return true
+      },
+      default: undefined
     }
   },
   methods: {
+    doUpdateValue (...args) {
+      const {
+        'onUpdate:value': onUpdateValue,
+        onChange,
+        __triggerFormInput,
+        __triggerFormChange
+      } = this
+      if (onUpdateValue) call(onUpdateValue, ...args)
+      if (onChange) call(onChange, ...args)
+      __triggerFormInput()
+      __triggerFormChange()
+    },
+    doFocus (...args) {
+      const {
+        onFocus,
+        __triggerFormFocus
+      } = this
+      if (onFocus) call(onFocus, ...args)
+      __triggerFormFocus()
+    },
+    doBlur (...args) {
+      const {
+        onBlur,
+        __triggerFormBlur
+      } = this
+      if (onBlur) call(onBlur, ...args)
+      __triggerFormBlur()
+    },
     handleClick () {
       if (!this.disabled) {
-        this['onUpdate:value'](!this.value)
-        this.__triggerFormInput()
-        this.__triggerFormChange()
+        this.doUpdateValue(!this.value)
       }
+    },
+    handleFocus (e) {
+      this.doFocus(e)
+    },
+    handleBlur (e) {
+      this.doBlur(e)
     }
   }
 }
diff --git a/src/transfer/src/Transfer.vue b/src/transfer/src/Transfer.vue
index aa5a18fda..2ee935d33 100644
--- a/src/transfer/src/Transfer.vue
+++ b/src/transfer/src/Transfer.vue
@@ -79,7 +79,9 @@
               </div>
             </n-scrollbar>
           </template>
-          <n-empty v-else />
+          <transition name="n-fade-in-transition" :appear="isMounted">
+            <n-empty v-if="!filteredSrcOpts.length" />
+          </transition>
         </div>
       </div>
       <div class="n-transfer-list__border-mask" />
@@ -165,7 +167,9 @@
               </div>
             </n-scrollbar>
           </template>
-          <n-empty v-else />
+          <transition name="n-fade-in-transition" :appear="isMounted">
+            <n-empty v-if="!filteredTgtOpts.length" />
+          </transition>
         </div>
       </div>
       <div class="n-transfer-list__border-mask" />
diff --git a/src/transfer/src/styles/themed-base/index.cssr.js b/src/transfer/src/styles/themed-base/index.cssr.js
index 1c163da0a..d78ccb301 100644
--- a/src/transfer/src/styles/themed-base/index.cssr.js
+++ b/src/transfer/src/styles/themed-base/index.cssr.js
@@ -1,5 +1,6 @@
 import { c, cTB, cB, cE, cM } from '../../../../_utils/cssr'
 import animationStyle from './animation.cssr.js'
+import fadeInTransition from '../../../../_styles/transitions/fade-in.js'
 
 export default c([
   ({ props }) => {
@@ -139,7 +140,9 @@ export default c([
                 left: '50%',
                 top: '50%',
                 transform: 'translateY(-50%) translateX(-50%)'
-              }),
+              }, [
+                fadeInTransition()
+              ]),
               cB('transfer-list-content', {
                 padding: 0,
                 margin: 0,