diff --git a/packages/components/image/__test__/__snapshots__/demo.test.js.snap b/packages/components/image/__test__/__snapshots__/demo.test.js.snap
index 4f7225b177..daa7bb9e26 100644
--- a/packages/components/image/__test__/__snapshots__/demo.test.js.snap
+++ b/packages/components/image/__test__/__snapshots__/demo.test.js.snap
@@ -17,7 +17,7 @@ exports[`Image Image base demo works fine 1`] = `
         ariaLabel="一个放置在墙角的黄色行李箱"
         height="72"
         mode="aspectFill"
-        src="https://tdesign.gtimg.com/mobile/demos/image1.jpeg"
+        src="https://tdesign.gtimg.com/demo/demo-image-1.png"
         width="72"
       />
     </wx-view>
@@ -33,7 +33,7 @@ exports[`Image Image base demo works fine 1`] = `
         ariaLabel="一个放置在墙角的黄色行李箱"
         height="72"
         mode="heightFix"
-        src="https://tdesign.gtimg.com/mobile/demos/image1.jpeg"
+        src="https://tdesign.gtimg.com/demo/demo-image-1.png"
         width="72"
       />
     </wx-view>
@@ -48,7 +48,7 @@ exports[`Image Image base demo works fine 1`] = `
       <t-image
         ariaLabel="一个放置在墙角的黄色行李箱"
         height="72"
-        src="https://tdesign.gtimg.com/mobile/demos/image1.jpeg"
+        src="https://tdesign.gtimg.com/demo/demo-image-1.png"
         width="72"
       />
     </wx-view>
@@ -68,7 +68,7 @@ exports[`Image Image base demo works fine 1`] = `
         ariaLabel="一个放置在墙角的黄色行李箱"
         height="72"
         mode="aspectFill"
-        src="https://tdesign.gtimg.com/mobile/demos/image1.jpeg"
+        src="https://tdesign.gtimg.com/demo/demo-image-1.png"
         width="72"
       />
     </wx-view>
@@ -84,7 +84,7 @@ exports[`Image Image base demo works fine 1`] = `
         ariaLabel="一个放置在墙角的黄色行李箱"
         height="72"
         shape="round"
-        src="https://tdesign.gtimg.com/mobile/demos/image1.jpeg"
+        src="https://tdesign.gtimg.com/demo/demo-image-1.png"
         width="72"
       />
     </wx-view>
@@ -100,7 +100,7 @@ exports[`Image Image base demo works fine 1`] = `
         ariaLabel="一个放置在墙角的黄色行李箱"
         height="72"
         shape="circle"
-        src="https://tdesign.gtimg.com/mobile/demos/image1.jpeg"
+        src="https://tdesign.gtimg.com/demo/demo-image-1.png"
         width="72"
       />
     </wx-view>
diff --git a/packages/components/image/_example/base/index.js b/packages/components/image/_example/base/index.js
index 9f289525c1..646a7b5240 100644
--- a/packages/components/image/_example/base/index.js
+++ b/packages/components/image/_example/base/index.js
@@ -1,5 +1,5 @@
 Component({
   data: {
-    imageSrc: 'https://tdesign.gtimg.com/mobile/demos/image1.jpeg',
+    imageSrc: 'https://tdesign.gtimg.com/demo/demo-image-1.png',
   },
 });
diff --git a/packages/tdesign-uniapp/.changelog/pr-4536.md b/packages/tdesign-uniapp/.changelog/pr-4536.md
new file mode 100644
index 0000000000..6b60e52748
--- /dev/null
+++ b/packages/tdesign-uniapp/.changelog/pr-4536.md
@@ -0,0 +1,7 @@
+---
+pr_number: 4536
+contributor: novlan1
+---
+
+- fix(Form): 修复表单图标在小程序下展示大小问题 @novlan1 ([#4536](https://github.com/Tencent/tdesign-miniprogram/pull/4536))
+- fix(Textarea): 修复 H5 端设置 `autosize` 后，文本内容超过 `maxHeight` 时无法滚动问题 @novlan1 ([#4536](https://github.com/Tencent/tdesign-miniprogram/pull/4536))
diff --git a/packages/tdesign-uniapp/example/src/pages/home/home.vue b/packages/tdesign-uniapp/example/src/pages/home/home.vue
index 7f54d77784..15e0eea272 100644
--- a/packages/tdesign-uniapp/example/src/pages/home/home.vue
+++ b/packages/tdesign-uniapp/example/src/pages/home/home.vue
@@ -4,7 +4,7 @@
     <!-- #endif -->
     <!-- #ifndef H5 -->
     <!-- #ifndef MP-ALIPAY -->
-    <t-demo-navbar title="TDesign UI" />
+    <t-demo-navbar title="TDesign UI" :left-arrow="false" />
     <!-- #endif -->
     <!-- #endif -->
     <view class="main">
@@ -31,7 +31,7 @@
     </view>
     <view class="footer">
       <view class="show_privacy" @click="showPrivacyWin"> 《TDesign组件库服务声明》 </view>
-      <t-footer text="该小程序仅演示示例，不收集个人信息。" />
+      <t-footer :text="`该${platformDesc}仅演示示例，不收集个人信息。`" />
       <t-footer :text="`Copyright © 1998 - ${currentYear} All Rights Reserved`" />
     </view>
     <trd-privacy ref="trdPrivacy" name="TDesign组件库" date="2023年11月14日" :win-style="winStyle" />
@@ -80,6 +80,21 @@ export default {
       debugEnabled: false,
     };
   },
+  computed: {
+    platformDesc() {
+      let result = '应用';
+
+      // #ifdef H5
+      result = '网站';
+      // #endif
+
+      // #ifdef MP
+      result = '小程序';
+      // #endif
+
+      return result;
+    },
+  },
   onLoad(options) {
     const { q, skyline: querySkyline } = options || {};
 
diff --git a/packages/uniapp-components/count-down/_example/base/index.vue b/packages/uniapp-components/count-down/_example/base/index.vue
index f807f56373..5564117926 100644
--- a/packages/uniapp-components/count-down/_example/base/index.vue
+++ b/packages/uniapp-components/count-down/_example/base/index.vue
@@ -21,6 +21,7 @@
       </view>
     </view>
 
+    <!-- #ifndef APP-HARMONY -->
     <view class="demo-count-down">
       <text class="demo-count-down-desc"> 带圆形底 </text>
       <view class="demo-count-down-content">
@@ -47,6 +48,7 @@
         />
       </view>
     </view>
+    <!-- #endif -->
   </view>
 </template>
 
diff --git a/packages/uniapp-components/count-down/_example/count-down.vue b/packages/uniapp-components/count-down/_example/count-down.vue
index 26228252ae..0fe8b41b49 100644
--- a/packages/uniapp-components/count-down/_example/count-down.vue
+++ b/packages/uniapp-components/count-down/_example/count-down.vue
@@ -10,9 +10,11 @@
       <base-demo />
     </t-demo>
 
+    <!-- #ifndef APP-HARMONY -->
     <t-demo padding title="02 组件尺寸" desc="倒计时 large/medium/small 尺寸">
       <size-demo />
     </t-demo>
+    <!-- #endif -->
   </view>
 </template>
 
diff --git a/packages/uniapp-components/count-down/count-down.vue b/packages/uniapp-components/count-down/count-down.vue
index 24f3e10613..c476f34991 100644
--- a/packages/uniapp-components/count-down/count-down.vue
+++ b/packages/uniapp-components/count-down/count-down.vue
@@ -55,12 +55,18 @@ export default {
         prefix,
         classPrefix: name,
         timeDataUnit: TimeDataUnit,
-        timeData: parseTimeData(0),
+        // 用 Object.freeze 阻断 Vue3 对 timeData 内部 5 个字段的深度响应化，
+        // 减少鸿蒙 V8 下 Proxy.set 的次数（高频 setTimeout 写 reactive 会触发 GC race -> SIGSEGV）
+        timeData: Object.freeze(parseTimeData(0)),
         formattedTime: '0',
         tools,
         timeoutId: null,
         isInitialTime: false,
         timeRange: [],
+        // 组件是否已销毁标记（非响应式，仅作为闭包标志使用）
+        // 用于防止 setTimeout 回调在组件卸载后访问已销毁的 reactive 实例
+        // 鸿蒙 (HarmonyOS) 端 V8 在该场景下会触发 SIGSEGV(SEGV_MAPERR)
+        _destroyed: false,
       };
     },
     watch: {
@@ -71,8 +77,12 @@ export default {
         immediate: true,
       },
     },
-    mounted() {},
+    mounted() {
+      this._destroyed = false;
+    },
     beforeUnmount() {
+      this._destroyed = true;
+      this.counting = false;
       if (this.timeoutId) {
         clearTimeout(this.timeoutId);
         this.timeoutId = null;
@@ -92,7 +102,10 @@ export default {
 
       pause() {
         this.counting = false;
-        this.timeoutId && clearTimeout(this.timeoutId);
+        if (this.timeoutId) {
+          clearTimeout(this.timeoutId);
+          this.timeoutId = null;
+        }
       },
 
       reset() {
@@ -119,10 +132,14 @@ export default {
 
         const { timeText } = parseFormat(remain, format);
 
-        const timeRange = format.split(':');
-
-        this.timeRange = timeRange;
-        this.timeData = timeData;
+        // timeRange 仅由 format(prop) 决定，初次或 format 变化时才赋值，
+        // 避免每帧都写 reactive 数组造成鸿蒙端 V8 GC race。
+        if (!this._lastFormat || this._lastFormat !== format) {
+          this.timeRange = format.split(':');
+          this._lastFormat = format;
+        }
+        // freeze 一下，禁止 Vue 深度响应化每帧的新对象
+        this.timeData = Object.freeze(timeData);
         this.formattedTime = timeText.replace(/:/g, ' : ');
 
         if (remain === 0 && (this.counting || this.isInitialTime)) {
@@ -133,7 +150,17 @@ export default {
       },
 
       doCount() {
+        // 毫秒模式下从 33ms (≈30fps) 降到 100ms (≈10fps)，肉眼仍流畅，
+        // 但 Proxy.set 频率降低 3 倍，显著降低鸿蒙 V8 GC race 概率。
+        let interval = this.millisecond ? 100 : 200;
+        // #ifdef APP-HARMONY
+        interval = this.millisecond ? 100 : 500;
+        // #endif
         this.timeoutId = setTimeout(() => {
+          // 组件已销毁，直接返回，避免对已失效的 reactive 实例做 set 操作
+          // 修复鸿蒙端因 Vue3 Proxy set 已销毁对象触发 V8 SIGSEGV 崩溃
+          if (this._destroyed) return;
+
           const time = this.getTime();
 
           if (this.millisecond) {
@@ -142,10 +169,10 @@ export default {
             this.updateTime(time);
           }
 
-          if (time !== 0) {
+          if (time !== 0 && !this._destroyed) {
             this.doCount();
           }
-        }, 33); // 30 帧，因此 1000 / 30 = 33
+        }, interval);
       },
     },
   }),
diff --git a/packages/uniapp-components/demo-navbar/demo-navbar.vue b/packages/uniapp-components/demo-navbar/demo-navbar.vue
index b439f12b59..c6fe010869 100644
--- a/packages/uniapp-components/demo-navbar/demo-navbar.vue
+++ b/packages/uniapp-components/demo-navbar/demo-navbar.vue
@@ -3,7 +3,7 @@
   <t-navbar
     :class="customClass"
     :title="title"
-    left-arrow
+    :left-arrow="leftArrow"
     :delta="-1"
     placeholder
     :z-index="99"
@@ -31,6 +31,10 @@ export default {
       type: String,
       default: '',
     },
+    leftArrow: {
+      type: Boolean,
+      default: true,
+    },
   },
   methods: {
     onDemoGoBack() {
diff --git a/packages/uniapp-components/form-item/form-item.less b/packages/uniapp-components/form-item/form-item.less
index 7ebb4d9eba..c80094c868 100644
--- a/packages/uniapp-components/form-item/form-item.less
+++ b/packages/uniapp-components/form-item/form-item.less
@@ -61,7 +61,7 @@
     flex-direction: column;
   }
 
-  &__icon {
+  :deep(.@{form-item}__icon) {
     font-size: 48rpx;
     color: @text-color-placeholder;
   }
diff --git a/packages/uniapp-components/form-item/form-item.vue b/packages/uniapp-components/form-item/form-item.vue
index 9c0e364e34..957a83e4de 100644
--- a/packages/uniapp-components/form-item/form-item.vue
+++ b/packages/uniapp-components/form-item/form-item.vue
@@ -72,7 +72,7 @@
       </view>
     </view>
 
-    <t-icon v-if="arrow" name="chevron-right" :class="formItemClass + '__icon'" />
+    <t-icon v-if="arrow" name="chevron-right" :t-class="formItemClass + '__icon'" />
   </view>
 </template>
 <script>
diff --git a/packages/uniapp-components/form/_example/horizontal/index.vue b/packages/uniapp-components/form/_example/horizontal/index.vue
index 8696b61703..a3a6c433eb 100644
--- a/packages/uniapp-components/form/_example/horizontal/index.vue
+++ b/packages/uniapp-components/form/_example/horizontal/index.vue
@@ -9,6 +9,7 @@
       show-error-message
       scroll-to-first-error="smooth"
       label-align="left"
+      :label-width="85"
       content-align="right"
       @reset="(e) => onReset(e, { tagId: 'form' })"
       @submit="(e) => onSubmit(e, { tagId: 'form' })"
@@ -54,20 +55,31 @@
         </t-radio-group>
       </t-form-item>
 
-      <t-form-item label="生日" name="birth" content-align="right">
+      <t-form-item arrow label="生日" name="birth" content-align="right">
         <t-input
           :value="formData.birth"
           :disabled="disabled"
           borderless
           align="right"
-          placeholder="请输入生日"
+          placeholder="请选择生日"
+          :readonly="!isH5"
           data-field="birth"
           style="flex: 1"
-          @change="(e) => onInputChange(e, { field: 'birth' })"
+          @click="showDatePicker"
+        />
+        <t-date-time-picker
+          :visible="visibleDatePicker"
+          auto-close
+          title="选择生日"
+          mode="date"
+          :default-value="formData.birth"
+          format="YYYY-MM-DD"
+          @update:visible="(e) => (visibleDatePicker = e)"
+          @change="onChangeDatePicker"
         />
       </t-form-item>
 
-      <t-form-item arrow label="籍贯" name="place" content-align="right">
+      <t-form-item arrow label="籍贯" name="place" content-align="left">
         <t-input
           ref="input"
           :value="formData.place"
@@ -168,6 +180,7 @@
 import TButton from '@tdesign/uniapp/button/button.vue';
 import TCascader from '@tdesign/uniapp/cascader/cascader.vue';
 import { canUseVirtualHost } from '@tdesign/uniapp/common/version';
+import TDateTimePicker from '@tdesign/uniapp/date-time-picker/date-time-picker.vue';
 import TForm from '@tdesign/uniapp/form/form.vue';
 import TFormItem from '@tdesign/uniapp/form-item/form-item.vue';
 import TInput from '@tdesign/uniapp/input/input.vue';
@@ -191,6 +204,7 @@ export default {
     TRadio,
     // TPopup,
     TCascader,
+    TDateTimePicker,
     TStepper,
     TRate,
     TTextarea,
@@ -209,7 +223,7 @@ export default {
         name: '',
         password: '',
         gender: '',
-        birth: '',
+        birth: '2020-01-01',
         place: '',
         age: 3,
         description: 2,
@@ -228,6 +242,7 @@ export default {
         ],
       },
       visibleCascader: false,
+      visibleDatePicker: false,
       address: '120119',
       rateGap: 8,
       action: 'https://service-bv448zsw-1257786608.gz.apigw.tencentcs.com/api/upload-demo',
@@ -451,6 +466,14 @@ export default {
     onChangeStepper(e) {
       this.formData.age = e.value;
     },
+    showDatePicker() {
+      this.visibleDatePicker = true;
+      uni.hideKeyboard();
+    },
+    onChangeDatePicker(e) {
+      this.formData.birth = e.value;
+      this.visibleDatePicker = false;
+    },
     onFail(e) {
       console.log('[onFail]: ', e);
     },
diff --git a/packages/uniapp-components/form/_example/vertical/index.vue b/packages/uniapp-components/form/_example/vertical/index.vue
index 99c21b6f91..abb4cfa512 100644
--- a/packages/uniapp-components/form/_example/vertical/index.vue
+++ b/packages/uniapp-components/form/_example/vertical/index.vue
@@ -8,6 +8,7 @@
       show-error-message
       scroll-to-first-error="smooth"
       label-align="top"
+      :label-width="85"
       @reset="(e) => onReset(e, { tagId: 'form' })"
       @submit="(e) => onSubmit(e, { tagId: 'form' })"
     >
@@ -57,10 +58,21 @@
           :value="formData.birth"
           :disabled="disabled"
           borderless
-          placeholder="请输入生日"
+          placeholder="请选择生日"
+          :readonly="true"
           data-field="birth"
           style="flex: 1"
-          @change="(e) => onInputChange(e, { field: 'birth' })"
+          @click="showDatePicker"
+        />
+        <t-date-time-picker
+          :visible="visibleDatePicker"
+          auto-close
+          title="选择生日"
+          mode="date"
+          :default-value="formData.birth"
+          format="YYYY-MM-DD"
+          @update:visible="(e) => (visibleDatePicker = e)"
+          @change="onChangeDatePicker"
         />
       </t-form-item>
 
@@ -163,6 +175,7 @@
 import TButton from '@tdesign/uniapp/button/button.vue';
 import TCascader from '@tdesign/uniapp/cascader/cascader.vue';
 import { canUseVirtualHost } from '@tdesign/uniapp/common/version';
+import TDateTimePicker from '@tdesign/uniapp/date-time-picker/date-time-picker.vue';
 import TForm from '@tdesign/uniapp/form/form.vue';
 import TFormItem from '@tdesign/uniapp/form-item/form-item.vue';
 import TInput from '@tdesign/uniapp/input/input.vue';
@@ -184,6 +197,7 @@ export default {
     TRadioGroup,
     TRadio,
     TCascader,
+    TDateTimePicker,
     TStepper,
     TRate,
     TTextarea,
@@ -202,7 +216,7 @@ export default {
         name: '',
         password: '',
         gender: '',
-        birth: '',
+        birth: '2020-01-01',
         place: '',
         age: 3,
         description: 2,
@@ -221,6 +235,7 @@ export default {
         ],
       },
       visibleCascader: false,
+      visibleDatePicker: false,
       address: '120119',
       rateGap: 8,
       action: 'https://service-bv448zsw-1257786608.gz.apigw.tencentcs.com/api/upload-demo',
@@ -444,6 +459,14 @@ export default {
     onChangeStepper(e) {
       this.formData.age = e.value;
     },
+    showDatePicker() {
+      this.visibleDatePicker = true;
+      uni.hideKeyboard();
+    },
+    onChangeDatePicker(e) {
+      this.formData.birth = e.value;
+      this.visibleDatePicker = false;
+    },
     onFail(e) {
       console.log('[onFail]: ', e);
     },
diff --git a/packages/uniapp-components/image/_example/base/index.vue b/packages/uniapp-components/image/_example/base/index.vue
index 596d1e948d..ee212a5e86 100644
--- a/packages/uniapp-components/image/_example/base/index.vue
+++ b/packages/uniapp-components/image/_example/base/index.vue
@@ -40,7 +40,7 @@ export default {
   },
   data() {
     return {
-      imageSrc: 'https://tdesign.gtimg.com/mobile/demos/image1.jpeg',
+      imageSrc: 'https://tdesign.gtimg.com/demo/demo-image-1.png',
     };
   },
   created() {},
diff --git a/packages/uniapp-components/popover/_example/popover.vue b/packages/uniapp-components/popover/_example/popover.vue
index 3307f580a4..e80e62f9b1 100644
--- a/packages/uniapp-components/popover/_example/popover.vue
+++ b/packages/uniapp-components/popover/_example/popover.vue
@@ -2,7 +2,7 @@
   <view>
     <t-demo-navbar custom-class="demo-navbar" title="Popover" />
     <t-demo-header title="Popover 弹出气泡" desc="用于文字提示的气泡框。" notice="渲染框架支持情况：WebView" />
-    <view class="tdesign-demo-popover">
+    <view class="demo">
       <t-demo title="01 组件类型" padding>
         <base-demo />
       </t-demo>
diff --git a/packages/uniapp-components/popup/_example/custom-close/index.vue b/packages/uniapp-components/popup/_example/custom-close/index.vue
index c9ef8ed151..6bed4a87bd 100644
--- a/packages/uniapp-components/popup/_example/custom-close/index.vue
+++ b/packages/uniapp-components/popup/_example/custom-close/index.vue
@@ -11,7 +11,7 @@
       size="large"
       variant="outline"
       theme="primary"
-      custom-style="display: block; margin-top: 32rpx"
+      custom-style="margin-top: 32rpx"
       @click="handlePopup"
     >
       居中弹出层-带自定义关闭按钮
diff --git a/packages/uniapp-components/popup/_example/popup.vue b/packages/uniapp-components/popup/_example/popup.vue
index 5a9b227efd..5ac0c50b48 100644
--- a/packages/uniapp-components/popup/_example/popup.vue
+++ b/packages/uniapp-components/popup/_example/popup.vue
@@ -6,7 +6,7 @@
       desc="由其他控件触发，屏幕滑出或弹出一块自定义内容区域。"
       notice="渲染框架支持情况：Skyline、WebView"
     />
-    <view class="tdesign-demo-popup">
+    <view class="demo">
       <t-demo title="01 组件类型" desc="基础弹出层" padding>
         <base-demo />
       </t-demo>
diff --git a/packages/uniapp-components/popup/_example/skyline/popup.vue b/packages/uniapp-components/popup/_example/skyline/popup.vue
index d4e8ada242..c8c1fae07c 100644
--- a/packages/uniapp-components/popup/_example/skyline/popup.vue
+++ b/packages/uniapp-components/popup/_example/skyline/popup.vue
@@ -4,7 +4,7 @@
     <scroll-view scroll-y type="list" class="scroll-view">
       <view class="demo-title"> Popup 弹出层 </view>
       <view class="demo-desc"> 由其他控件触发，屏幕滑出或弹出一块自定义内容区域。 </view>
-      <view class="tdesign-demo-popup">
+      <view class="demo">
         <t-demo title="01 组件类型" desc="基础弹出层" padding>
           <base-demo />
         </t-demo>
diff --git a/packages/uniapp-components/tag/_example/tag.vue b/packages/uniapp-components/tag/_example/tag.vue
index 1b8323ebb6..8b2134ef64 100644
--- a/packages/uniapp-components/tag/_example/tag.vue
+++ b/packages/uniapp-components/tag/_example/tag.vue
@@ -1,7 +1,7 @@
 <template>
   <view>
     <t-demo-navbar custom-class="demo-navbar" title="Tag" />
-    <view>
+    <view class="demo">
       <t-demo-header title="Tag 标签" desc="用于表明主体的类目，属性或状态。" />
       <t-demo title="01 组件类型">
         <type-demo />
diff --git a/packages/uniapp-components/textarea/textarea.less b/packages/uniapp-components/textarea/textarea.less
index 7a43072264..585bc92f17 100644
--- a/packages/uniapp-components/textarea/textarea.less
+++ b/packages/uniapp-components/textarea/textarea.less
@@ -65,6 +65,7 @@
       resize: none;
       font: @textarea-text-font;
       color: @textarea-text-color;
+      overflow-y: auto;
     }
   }
 
diff --git a/packages/uniapp-pro-components/chat/chat-content/_example/base/index.vue b/packages/uniapp-pro-components/chat/chat-content/_example/base/index.vue
index e7326ea108..9e806381ec 100644
--- a/packages/uniapp-pro-components/chat/chat-content/_example/base/index.vue
+++ b/packages/uniapp-pro-components/chat/chat-content/_example/base/index.vue
@@ -19,7 +19,13 @@
 <script>
 import TChatContent from '@tdesign/uniapp-chat/chat-content/chat-content.vue';
 
-const markdownData = `# Markdown功能测试 (H1标题)
+let title = '# Markdown功能测试 (H1标题)';
+
+// #ifdef APP-HARMONY
+title = '# Markdown功能测试';
+// #endif
+
+const markdownData = `${title}
 
 ## 基础语法测试 (H2标题)