diff --git a/common/Index.ets b/common/Index.ets
index b970b3b..5a1f563 100644
--- a/common/Index.ets
+++ b/common/Index.ets
@@ -6,6 +6,8 @@ export { BridgeTracer } from './src/main/ets/log/BridgeTracer';
 export { EventBus, EventPayload } from './src/main/ets/event/EventBus';
 export { NavEvents, OpenGenericWebPayload, SwitchGamePayload, BackGamePayload }
   from './src/main/ets/event/NavEvents';
+export { ShareEvents, SharePanelRequest, SharePanelResult }
+  from './src/main/ets/event/ShareEvents';
 export { DIContainer, Factory } from './src/main/ets/di/DIContainer';
 export { ErrorCenter, ErrorStrategy, ErrorSink } from './src/main/ets/error/ErrorCenter';
 export { AppEnv } from './src/main/ets/env/AppEnv';
diff --git a/common/src/main/ets/event/ShareEvents.ets b/common/src/main/ets/event/ShareEvents.ets
new file mode 100644
index 0000000..c6d61f4
--- /dev/null
+++ b/common/src/main/ets/event/ShareEvents.ets
@@ -0,0 +1,27 @@
+/**
+ * 分享面板事件名 + 载荷（跨模块共享：ShareProvider(feature_capabilities) 发 SHOW_PANEL →
+ * BridgeGameContainer(entry) 订阅弹出自定义分享面板 → 用户选平台后经一次性 resultEvent 回投给 ShareProvider）。
+ *
+ * 对齐原 Android「自定义三按钮分享面板」（SharePanelHelper：微信/QQ/抖音 + 点空白关闭=取消）。
+ * 能力层不持 UI；面板 UI 在 entry 容器。一对一回传：ShareProvider 生成唯一 resultEvent，
+ * EventBus.once(resultEvent) 自动注销，避免多 Provider 实例广播串扰。
+ * 载荷用具名 interface（ArkTS 严格：禁 Record/无类型对象字面量），且禁传函数。
+ */
+export class ShareEvents {
+  /** 请求弹出分享面板。 */
+  static readonly SHOW_PANEL: string = 'share.showPanel';
+}
+
+/** SHOW_PANEL 载荷。 */
+export interface SharePanelRequest {
+  /** sharetypeBean 的原始 JSON（透传，由 ShareProvider 解析）。 */
+  data: string;
+  /** 用户选定平台后回投的一次性事件名（ShareProvider 已 EventBus.once 监听）。 */
+  resultEvent: string;
+}
+
+/** resultEvent 载荷（用户选定结果回投）。 */
+export interface SharePanelResult {
+  /** 'wechat' | 'qq' | 'douyin' | 'cancel' */
+  platform: string;
+}
diff --git a/entry/src/main/ets/components/SharePanel.ets b/entry/src/main/ets/components/SharePanel.ets
new file mode 100644
index 0000000..b2244a3
--- /dev/null
+++ b/entry/src/main/ets/components/SharePanel.ets
@@ -0,0 +1,68 @@
+/**
+ * 自定义分享面板（对齐原 Android SharePanelHelper：底部弹出 + 三按钮 微信/QQ/抖音 + 点空白关闭=取消）。
+ *
+ * 纯展示组件：由 BridgeGameContainer 以 @State visible 控制显隐，叠在 Stack 顶层。
+ * 用户点平台 → onPick(platform)；点空白/取消 → onPick('cancel')。无图标资源用文字按钮。
+ * 不持业务逻辑、不直接发 EventBus——回投由容器统一经一次性 resultEvent 完成（避免组件耦合事件名）。
+ */
+@Component
+export struct SharePanel {
+  /** 选择回调：'wechat' | 'qq' | 'douyin' | 'cancel'。 */
+  onPick: (platform: string) => void = () => { };
+
+  build() {
+    // 半透明遮罩：点击空白处取消
+    Column() {
+      Blank()
+        .layoutWeight(1)
+        .width('100%')
+        .onClick(() => this.onPick('cancel'))
+
+      // 内容区：点击不关闭（消费事件）
+      Column() {
+        Text('分享到')
+          .fontSize(16)
+          .fontColor('#333333')
+          .margin({ top: 16, bottom: 16 })
+
+        Row() {
+          this.platformButton('微信', 'wechat', '#07C160')
+          this.platformButton('QQ', 'qq', '#12B7F5')
+          this.platformButton('抖音', 'douyin', '#000000')
+        }
+        .width('100%')
+        .justifyContent(FlexAlign.SpaceEvenly)
+        .margin({ bottom: 12 })
+
+        Divider().color('#EEEEEE')
+
+        Text('取消')
+          .fontSize(16)
+          .fontColor('#666666')
+          .width('100%')
+          .textAlign(TextAlign.Center)
+          .padding({ top: 14, bottom: 14 })
+          .onClick(() => this.onPick('cancel'))
+      }
+      .width('100%')
+      .backgroundColor(Color.White)
+      .borderRadius({ topLeft: 16, topRight: 16 })
+      .onClick(() => { /* 消费点击，避免穿透到遮罩 */ })
+    }
+    .width('100%')
+    .height('100%')
+    .backgroundColor('rgba(0,0,0,0.45)')
+  }
+
+  @Builder
+  platformButton(label: string, platform: string, color: string) {
+    Column() {
+      Circle({ width: 56, height: 56 }).fill(color)
+      Text(label)
+        .fontSize(13)
+        .fontColor('#333333')
+        .margin({ top: 8 })
+    }
+    .onClick(() => this.onPick(platform))
+  }
+}
diff --git a/entry/src/main/ets/pages/BridgeGameContainer.ets b/entry/src/main/ets/pages/BridgeGameContainer.ets
index 018de79..456472a 100644
--- a/entry/src/main/ets/pages/BridgeGameContainer.ets
+++ b/entry/src/main/ets/pages/BridgeGameContainer.ets
@@ -6,9 +6,10 @@ import { ConfigManager, ResourceManager, AppDataInjector, AppDataValues } from '
 import { KvStore, LocalUploadServer } from 'platform';
 import { OutboundHandlers } from 'contracts';
 import { AppEnv, EventBus, EventPayload, NavEvents, OpenGenericWebPayload, SwitchGamePayload,
-  BackGamePayload, Logger } from 'common';
+  BackGamePayload, ShareEvents, SharePanelRequest, SharePanelResult, Logger } from 'common';
 import { BridgeGameParams, GenericWebParams, GenericWebResult, RouteName, AppEvents } from '../routes/AppRoutes';
 import { WebSlot } from '../web/WebSlot';
+import { SharePanel } from '../components/SharePanel';
 
 /**
  * 大厅/子游戏容器（对应 webviewActivity，框架 §7.1/§7.5）。**双 Web 槽模型**：
@@ -34,6 +35,10 @@ export struct BridgeGameContainer {
   private cancels: Array<() => void> = [];
   /** 非空 → 子游戏 Web 显示（路径 A 切换）。 */
   @State private subgameUrl: string = '';
+  /** 分享面板显隐（叠在 Stack 顶层，对齐 Android SharePanelHelper）。 */
+  @State private sharePanelVisible: boolean = false;
+  /** 当前分享面板的一次性回投事件名（用户选定平台后 emit 回 ShareProvider）。 */
+  private shareResultEvent: string = '';
 
   aboutToAppear(): void {
     if (AppEnv.isDebug()) {
@@ -99,6 +104,32 @@ export struct BridgeGameContainer {
     this.cancels.push(EventBus.on(NavEvents.OPEN_GENERIC_WEB, (p?: EventPayload) => this.openGenericWeb(p)));
     this.cancels.push(EventBus.on(NavEvents.SWITCH_GAME, (p?: EventPayload) => this.switchGame(p)));
     this.cancels.push(EventBus.on(NavEvents.BACK_GAME, (p?: EventPayload) => this.backToLobby(p)));
+    this.cancels.push(EventBus.on(ShareEvents.SHOW_PANEL, (p?: EventPayload) => this.showSharePanel(p)));
+  }
+
+  /** 收到 ShareProvider 的 SHOW_PANEL：记下一次性回投事件名并弹出面板。 */
+  private showSharePanel(p?: EventPayload): void {
+    if (p === undefined) {
+      return;
+    }
+    // 已有面板未关闭：先按取消回投旧请求，避免上一个 once 永不触发致 ShareProvider 悬挂。
+    if (this.sharePanelVisible && this.shareResultEvent !== '') {
+      this.emitShareResult('cancel');
+    }
+    const req = p as SharePanelRequest;
+    this.shareResultEvent = req.resultEvent;
+    this.sharePanelVisible = true;
+  }
+
+  /** 用户选定平台/取消：回投并关闭面板。 */
+  private emitShareResult(platform: string): void {
+    const ev: string = this.shareResultEvent;
+    this.shareResultEvent = '';
+    this.sharePanelVisible = false;
+    if (ev !== '') {
+      const result: SharePanelResult = { platform };
+      EventBus.emit(ev, result);
+    }
   }
 
   /** 路径 B：打开通用网页容器；关闭回传 → 当前激活槽 callHandler('getWebdata')。 */
@@ -211,9 +242,22 @@ export struct BridgeGameContainer {
             })
             .onRenderExited((event: OnRenderExitedEvent) => this.slotS?.onRenderExited(event.renderExitReason))
         }
+
+        // 分享面板（顶层叠加；用户选平台/取消 → 一次性回投 ShareProvider）
+        if (this.sharePanelVisible) {
+          SharePanel({ onPick: (platform: string) => this.emitShareResult(platform) })
+        }
       }
       .width('100%').height('100%')
     }
     .hideTitleBar(true)
+    .onBackPressed(() => {
+      // 分享面板打开时，返回键关闭面板并按取消回投（对齐 Android 点空白关闭）
+      if (this.sharePanelVisible) {
+        this.emitShareResult('cancel');
+        return true;
+      }
+      return false;
+    })
   }
 }
diff --git a/entry/src/main/ets/web/WebSlot.ets b/entry/src/main/ets/web/WebSlot.ets
index b5ab61c..89aab8a 100644
--- a/entry/src/main/ets/web/WebSlot.ets
+++ b/entry/src/main/ets/web/WebSlot.ets
@@ -66,6 +66,7 @@ export class WebSlot {
         kv,
         uploadServer: this.uploadServer,
         log: Logger.tag(`Cap-${this.role}`),
+        captureCanvas: (canvasId: string): Promise<string> => this.captureCanvas(canvasId),
       };
       const registrar = new CapabilityRegistrar(buildCapabilities());
       registrar.registerAll(bridge, ctx);
@@ -192,6 +193,49 @@ export class WebSlot {
     this.adapter = undefined;
   }
 
+  /**
+   * 截取本槽 Web 内的 canvas（截图分享）。脚本在 H5 内 toDataURL，返回 dataURL；
+   * runJavaScript 回调的 result 是 JSON 字符串（外层带引号），需 JSON.parse 去引号还原。
+   * 非激活/出错一律返回空串（由 ShareProvider 降级网页分享，绝不抛错）。
+   */
+  private captureCanvas(canvasId: string): Promise<string> {
+    if (!this.active || this.disposed) {
+      return Promise.resolve('');
+    }
+    const sel: string = canvasId !== ''
+      ? `document.getElementById(${JSON.stringify(canvasId)}).toDataURL('image/png')`
+      : `document.querySelector('canvas').toDataURL('image/jpeg',0.8)`;
+    const script: string = `(function(){try{return ${sel};}catch(e){return '';}})()`;
+    return new Promise<string>((resolve: (v: string) => void) => {
+      try {
+        this.controller.runJavaScript(script, (err: BusinessError, result: string) => {
+          if (err) {
+            WebSlot.log.w(`[${this.role}] captureCanvas runJavaScript error: ${err.message}`);
+            resolve('');
+            return;
+          }
+          resolve(WebSlot.parseJsString(result));
+        });
+      } catch (e) {
+        WebSlot.log.w(`[${this.role}] captureCanvas failed: ${(e as BusinessError).message}`);
+        resolve('');
+      }
+    });
+  }
+
+  /** runJavaScript 返回值是 JSON 字符串（字符串结果外层带引号）；去引号还原，异常返回空串。 */
+  private static parseJsString(result: string): string {
+    if (result === undefined || result === null || result === '' || result === 'null') {
+      return '';
+    }
+    try {
+      const parsed: Object = JSON.parse(result) as Object;
+      return typeof parsed === 'string' ? parsed as string : '';
+    } catch (e) {
+      return '';
+    }
+  }
+
   private flushPending(): void {
     if (this.pendingWebdata !== undefined) {
       this.bridgeCtrl?.callHandler(OutboundHandlers.GetWebData, this.pendingWebdata);
diff --git a/feature_capabilities/src/main/ets/core/CapabilityProvider.ets b/feature_capabilities/src/main/ets/core/CapabilityProvider.ets
index 4ad8857..578ef1a 100644
--- a/feature_capabilities/src/main/ets/core/CapabilityProvider.ets
+++ b/feature_capabilities/src/main/ets/core/CapabilityProvider.ets
@@ -23,6 +23,12 @@ export interface CapabilityContext {
   uploadServer: LocalUploadServer;
   /** 通用日志。 */
   log: Logger;
+  /**
+   * 截取本槽当前 Web 的 canvas（截图分享 type=="2"，对齐 Android GlobalWebViewHelper.getCanvasBase64）。
+   * @param canvasId 可选元素 id；空则取首个 <canvas>。
+   * @returns dataURL（如 "data:image/jpeg;base64,..."）；失败/非激活返回空串。
+   */
+  captureCanvas?: (canvasId: string) => Promise<string>;
 }
 
 /** 能力插件接口。 */
diff --git a/feature_capabilities/src/main/ets/providers/ShareProvider.ets b/feature_capabilities/src/main/ets/providers/ShareProvider.ets
index 964771d..b615c36 100644
--- a/feature_capabilities/src/main/ets/providers/ShareProvider.ets
+++ b/feature_capabilities/src/main/ets/providers/ShareProvider.ets
@@ -1,34 +1,60 @@
 /**
- * 分享能力（契约 §8.1/§10.1，T-M3-13）。微信开放 SDK。
- *  - friendsSharetypeUrlToptitleDescript：data=sharetypeBean JSON。
- *    sharefriend "2"→朋友圈 / 其他→会话；type "1"网页/"2"Canvas截图/"3"图片/"4"视频。
- *  - 回传 sharesuccess {success(2成功/3取消), type(1好友/2朋友圈)}。
+ * 分享能力（契约 §8.1/§10.1，T-M3-13）。对齐原 Android「自定义三按钮分享面板」（微信/QQ/抖音）。
  *
- * 本版完整支持 type=1（网页分享）；type 2/3/4 暂回退为网页分享（webpageUrl），见 TODO。
- * ⚠ 运行期成功需在微信开放平台注册本 HarmonyOS 应用（bundleName+指纹 绑定 AppID）。
+ *  H5 调 friendsSharetypeUrlToptitleDescript（data=sharetypeBean JSON）→ 弹自定义面板（entry 容器渲染）。
+ *  用户点平台后经一次性 resultEvent 回投本 Provider：
+ *   - 微信（@tencent/wechat_open_sdk）：
+ *       type=="2" → Canvas 截图图片分享（截当前激活 Web 的 canvas.toDataURL → 落盘 → WXImageObject.uri）；
+ *       其他 type → 网页分享（WXWebpageObject）。
+ *       scene：sharefriend=="1" → 好友(WXSceneSession)，否则 → 朋友圈(WXSceneTimeline)。
+ *       分享结果回传 H5：callHandler('sharesuccess', {success:2成功/3取消, type:1好友/2朋友圈})。
+ *   - QQ / 抖音（不集成对应 SDK，用 HarmonyOS 系统分享 @kit.ShareKit，让用户在系统面板选目标 app）：
+ *       type=="1" → 文本(title+description)；type=="2" → 截图图片；
+ *       type=="4"(抖音视频) → 视频(webpageUrl 为视频地址)；else → 网页链接(webpageUrl)。**不回传 sharesuccess**。
+ *
+ * ⚠ 微信运行期成功需在微信开放平台注册本 HarmonyOS 应用（bundleName+指纹 绑定 AppID）。
+ * 截图/系统分享拉起/微信分享 均只能真机验证。
  */
-import { SendMessageToWXReq, WXMediaMessage, WXWebpageObject, ErrCode } from '@tencent/wechat_open_sdk';
+import { SendMessageToWXReq, WXMediaMessage, WXWebpageObject, WXImageObject, ErrCode } from '@tencent/wechat_open_sdk';
+import { systemShare } from '@kit.ShareKit';
+import { uniformTypeDescriptor as utd } from '@kit.ArkData';
+import { fileUri } from '@kit.CoreFileKit';
+import { common } from '@kit.AbilityKit';
+import { BusinessError } from '@kit.BasicServicesKit';
+import { util } from '@kit.ArkTS';
 import { BridgeController } from 'feature_bridge';
 import { InboundHandlers, OutboundHandlers, SharetypeBean, ShareSuccessResp } from 'contracts';
-import { Logger } from 'common';
+import { EventBus, Logger, ShareEvents, SharePanelRequest, SharePanelResult } from 'common';
+import { FileSystem } from 'platform';
 import { CapabilityContext, CapabilityProvider } from '../core/CapabilityProvider';
 import { WeChatApi } from '../wx/WeChatApi';
 
 export class ShareProvider implements CapabilityProvider {
+  /** 进程内实例计数：双 Web 槽各有一个 ShareProvider 实例，用它给 resultEvent 命名空间隔离。 */
+  private static instanceCount: number = 0;
   readonly name: string = 'share';
   private readonly log: Logger = Logger.tag('ShareProvider');
+  private readonly instanceId: number;
   private bridge: BridgeController | undefined = undefined;
   private ctx: CapabilityContext | undefined = undefined;
+  /** 截图落盘 + resultEvent 命名计数器（实例自增，避免 Math.random 串扰）。 */
+  private seq: number = 0;
+
+  constructor() {
+    ShareProvider.instanceCount += 1;
+    this.instanceId = ShareProvider.instanceCount;
+  }
 
   register(bridge: BridgeController, ctx: CapabilityContext): void {
     this.bridge = bridge;
     this.ctx = ctx;
     bridge.registerHandler(InboundHandlers.FriendsShare, (data: string, _cb: (resp: string) => void) => {
-      this.share(data);
+      this.onShare(data);
     });
   }
 
-  private share(data: string): void {
+  /** 入站：校验 bean → 发起面板请求（一对一回投）。 */
+  private onShare(data: string): void {
     const ctx = this.ctx;
     if (ctx === undefined) {
       return;
@@ -40,36 +66,263 @@ export class ShareProvider implements CapabilityProvider {
       this.log.w(`share bad json: ${(e as Error).message}`);
       return;
     }
-    const typeNum: number = bean.sharefriend === '2' ? 2 : 1;
+    if (bean === undefined || bean === null) {
+      this.log.w('share bean empty');
+      return;
+    }
+    this.seq += 1;
+    const resultEvent: string = `share.result.${this.instanceId}.${this.seq}`;
+    EventBus.once(resultEvent, (p) => this.onPlatformChosen(bean, p));
+    const req: SharePanelRequest = { data, resultEvent };
+    EventBus.emit(ShareEvents.SHOW_PANEL, req);
+  }
 
+  /** 用户在面板选定平台后回投。 */
+  private onPlatformChosen(bean: SharetypeBean, payload?: Object): void {
+    const platform: string = payload !== undefined ? (payload as SharePanelResult).platform : 'cancel';
+    if (platform === 'wechat') {
+      this.shareToWeChat(bean);
+    } else if (platform === 'qq') {
+      this.shareViaSystem(bean, 'qq');
+    } else if (platform === 'douyin') {
+      this.shareViaSystem(bean, 'douyin');
+    }
+    // cancel：不分享、不回传（对齐 Android 点空白关闭面板）。
+  }
+
+  // —— 微信 ——
+
+  /** sharefriend=="1" → 好友(回传 type=1)；否则 → 朋友圈(回传 type=2)。对齐 Android scene 语义。 */
+  private wechatReportType(bean: SharetypeBean): number {
+    return bean.sharefriend === '1' ? 1 : 2;
+  }
+
+  private shareToWeChat(bean: SharetypeBean): void {
+    const ctx = this.ctx;
+    if (ctx === undefined) {
+      return;
+    }
+    const reportType: number = this.wechatReportType(bean);
     const wx: WeChatApi = WeChatApi.getInstance();
     if (!wx.isWXInstalled()) {
       this.log.i('WeChat not installed; report cancel');
-      this.reportResult(3, typeNum);
+      this.reportResult(3, reportType);
       return;
     }
+    if (bean.type === '2') {
+      // Canvas 截图图片分享（失败降级网页）
+      const cap = ctx.captureCanvas;
+      if (cap === undefined) {
+        this.wechatWebPage(ctx.uiAbilityContext, wx, bean, reportType);
+        return;
+      }
+      cap(bean.sharetype).then((dataUrl: string) => {
+        const filePath: string = dataUrl !== '' ? this.saveDataUrlToFile(ctx.uiAbilityContext, dataUrl) : '';
+        if (filePath !== '') {
+          this.wechatImage(ctx.uiAbilityContext, wx, filePath, bean, reportType);
+        } else {
+          this.log.w('canvas capture empty; fallback to webpage share');
+          this.wechatWebPage(ctx.uiAbilityContext, wx, bean, reportType);
+        }
+      }).catch((e: Error) => {
+        this.log.w(`captureCanvas failed: ${e.message}; fallback to webpage share`);
+        this.wechatWebPage(ctx.uiAbilityContext, wx, bean, reportType);
+      });
+      return;
+    }
+    this.wechatWebPage(ctx.uiAbilityContext, wx, bean, reportType);
+  }
 
+  private wechatScene(bean: SharetypeBean): number {
+    return bean.sharefriend === '1' ? SendMessageToWXReq.WXSceneSession : SendMessageToWXReq.WXSceneTimeline;
+  }
+
+  private wechatWebPage(ctx: common.UIAbilityContext, wx: WeChatApi, bean: SharetypeBean, reportType: number): void {
     const req: SendMessageToWXReq = new SendMessageToWXReq();
-    req.scene = bean.sharefriend === '2' ? SendMessageToWXReq.WXSceneTimeline : SendMessageToWXReq.WXSceneSession;
-
+    req.scene = this.wechatScene(bean);
     const msg: WXMediaMessage = new WXMediaMessage();
     msg.title = bean.title;
     msg.description = bean.description;
-    // TODO(M3)：type "2" Canvas 截图（需容器 runJavaScript canvas.toDataURL + LocalUploadServer）、
-    //   "3" 图片链接（下载后 WXImageObject）、"4" 视频。当前统一按网页分享回退，保证可分享不报错。
     const web: WXWebpageObject = new WXWebpageObject();
     web.webpageUrl = bean.webpageUrl;
     msg.mediaObject = web;
     req.message = msg;
-
-    wx.sendShare(ctx.uiAbilityContext, req, (resp) => {
-      const success: number = resp.errCode === ErrCode.ERR_OK ? 2 : 3;
-      this.reportResult(success, typeNum);
+    wx.sendShare(ctx, req, (resp) => {
+      this.reportResult(resp.errCode === ErrCode.ERR_OK ? 2 : 3, reportType);
     });
   }
 
+  private wechatImage(ctx: common.UIAbilityContext, wx: WeChatApi, filePath: string,
+    bean: SharetypeBean, reportType: number): void {
+    const req: SendMessageToWXReq = new SendMessageToWXReq();
+    req.scene = this.wechatScene(bean);
+    const msg: WXMediaMessage = new WXMediaMessage();
+    const img: WXImageObject = new WXImageObject();
+    img.uri = fileUri.getUriFromPath(filePath); // 沙箱文件 file uri，SDK 支持 jpeg/png
+    msg.mediaObject = img;
+    req.message = msg;
+    wx.sendShare(ctx, req, (resp) => {
+      this.reportResult(resp.errCode === ErrCode.ERR_OK ? 2 : 3, reportType);
+    });
+  }
+
+  // —— QQ / 抖音：HarmonyOS 系统分享（不回传 sharesuccess）——
+
+  private shareViaSystem(bean: SharetypeBean, platform: string): void {
+    const ctx = this.ctx;
+    if (ctx === undefined) {
+      return;
+    }
+    const uiCtx: common.UIAbilityContext = ctx.uiAbilityContext;
+    if (bean.type === '2') {
+      // 截图图片
+      const cap = ctx.captureCanvas;
+      if (cap === undefined) {
+        this.systemText(uiCtx, bean, platform);
+        return;
+      }
+      cap(bean.sharetype).then((dataUrl: string) => {
+        const filePath: string = dataUrl !== '' ? this.saveDataUrlToFile(uiCtx, dataUrl) : '';
+        if (filePath !== '') {
+          this.systemImage(uiCtx, filePath, bean);
+        } else {
+          this.log.w(`[${platform}] canvas capture empty; fallback to text`);
+          this.systemText(uiCtx, bean, platform);
+        }
+      }).catch((e: Error) => {
+        this.log.w(`[${platform}] captureCanvas failed: ${e.message}; fallback to text`);
+        this.systemText(uiCtx, bean, platform);
+      });
+      return;
+    }
+    if (bean.type === '1') {
+      this.systemText(uiCtx, bean, platform);
+      return;
+    }
+    if (bean.type === '4') {
+      // 抖音视频：webpageUrl 为视频地址
+      this.systemVideo(uiCtx, bean);
+      return;
+    }
+    // else：网页链接（title + description + webpageUrl）
+    this.systemLink(uiCtx, bean);
+  }
+
+  /** 文本分享（title + description，对齐 Android 文本拼接）。 */
+  private systemText(uiCtx: common.UIAbilityContext, bean: SharetypeBean, _platform: string): void {
+    const text: string = this.joinText(bean.title, bean.description);
+    const record: systemShare.SharedRecord = { utd: utd.UniformDataType.PLAIN_TEXT, content: text !== '' ? text : ' ' };
+    this.showSystemShare(uiCtx, record);
+  }
+
+  /** 网页链接分享。 */
+  private systemLink(uiCtx: common.UIAbilityContext, bean: SharetypeBean): void {
+    const url: string = bean.webpageUrl !== '' ? bean.webpageUrl : ' ';
+    const record: systemShare.SharedRecord = {
+      utd: utd.UniformDataType.HYPERLINK,
+      content: url,
+      title: bean.title !== '' ? bean.title : undefined,
+      description: bean.description !== '' ? bean.description : undefined,
+    };
+    this.showSystemShare(uiCtx, record);
+  }
+
+  /** 视频分享（webpageUrl 为视频地址；远程地址降级为链接分享）。 */
+  private systemVideo(uiCtx: common.UIAbilityContext, bean: SharetypeBean): void {
+    const path: string = bean.webpageUrl;
+    if (path !== '' && (path.startsWith('/') || path.startsWith('file://')) && FileSystem.exists(this.toLocalPath(path))) {
+      const local: string = this.toLocalPath(path);
+      const typeId: string = utd.getUniformDataTypeByFilenameExtension(this.extOf(local), utd.UniformDataType.VIDEO);
+      const record: systemShare.SharedRecord = {
+        utd: typeId,
+        uri: fileUri.getUriFromPath(local),
+        title: bean.title !== '' ? bean.title : undefined,
+        description: bean.description !== '' ? bean.description : undefined,
+      };
+      this.showSystemShare(uiCtx, record);
+      return;
+    }
+    // 非本地视频文件：以链接形式分享地址（系统分享无法直接推送远程视频）
+    this.systemLink(uiCtx, bean);
+  }
+
+  /** 图片分享（沙箱文件）。 */
+  private systemImage(uiCtx: common.UIAbilityContext, filePath: string, bean: SharetypeBean): void {
+    const typeId: string = utd.getUniformDataTypeByFilenameExtension(this.extOf(filePath), utd.UniformDataType.IMAGE);
+    const record: systemShare.SharedRecord = {
+      utd: typeId,
+      uri: fileUri.getUriFromPath(filePath),
+      title: bean.title !== '' ? bean.title : undefined,
+      description: bean.description !== '' ? bean.description : undefined,
+    };
+    this.showSystemShare(uiCtx, record);
+  }
+
+  /** 拉起系统分享面板（失败 log 不崩溃）。 */
+  private showSystemShare(uiCtx: common.UIAbilityContext, record: systemShare.SharedRecord): void {
+    try {
+      const data: systemShare.SharedData = new systemShare.SharedData(record);
+      const controller: systemShare.ShareController = new systemShare.ShareController(data);
+      controller.show(uiCtx, {
+        selectionMode: systemShare.SelectionMode.SINGLE,
+        previewMode: systemShare.SharePreviewMode.DETAIL,
+      }).catch((e: BusinessError) => {
+        this.log.w(`systemShare show failed: code=${e.code} ${e.message}`);
+      });
+    } catch (e) {
+      this.log.w(`systemShare init failed: ${(e as BusinessError).message}`);
+    }
+  }
+
+  // —— 公共 ——
+
   private reportResult(success: number, type: number): void {
     const out: ShareSuccessResp = { success, type };
     this.bridge?.callHandler(OutboundHandlers.ShareSuccess, JSON.stringify(out));
   }
+
+  /**
+   * dataURL（"data:image/...;base64,XXXX"）→ 解码 → 写沙箱 filesDir/share/shot_<seq>.jpg → 返回沙箱路径。
+   * 失败返回空串（调用方降级）。
+   */
+  private saveDataUrlToFile(uiCtx: common.UIAbilityContext, dataUrl: string): string {
+    try {
+      const comma: number = dataUrl.indexOf(',');
+      const base64: string = comma >= 0 ? dataUrl.substring(comma + 1) : dataUrl;
+      if (base64 === '') {
+        return '';
+      }
+      const bytes: Uint8Array = new util.Base64Helper().decodeSync(base64);
+      this.seq += 1;
+      const ext: string = dataUrl.indexOf('image/png') >= 0 ? '.png' : '.jpg';
+      const filePath: string = `${uiCtx.filesDir}/share/shot_${this.seq}${ext}`;
+      FileSystem.writeBytes(filePath, bytes);
+      return filePath;
+    } catch (e) {
+      this.log.w(`saveDataUrlToFile failed: ${(e as Error).message}`);
+      return '';
+    }
+  }
+
+  private joinText(title: string, description: string): string {
+    const parts: string[] = [];
+    if (title !== '') {
+      parts.push(title);
+    }
+    if (description !== '') {
+      parts.push(description);
+    }
+    return parts.join('\n\n');
+  }
+
+  /** file:// 前缀 → 本地路径。 */
+  private toLocalPath(p: string): string {
+    return p.startsWith('file://') ? p.substring('file://'.length) : p;
+  }
+
+  private extOf(path: string): string {
+    const dot: number = path.lastIndexOf('.');
+    const slash: number = path.lastIndexOf('/');
+    return dot > slash && dot >= 0 ? path.substring(dot) : '.jpg';
+  }
 }
diff --git a/platform/src/main/ets/fs/FileSystem.ets b/platform/src/main/ets/fs/FileSystem.ets
index ea9f6f2..40e57c3 100644
--- a/platform/src/main/ets/fs/FileSystem.ets
+++ b/platform/src/main/ets/fs/FileSystem.ets
@@ -64,6 +64,19 @@ export class FileSystem {
     }
   }
 
+  /** 写二进制（覆盖；自动建父目录）。用于截图分享落盘等。 */
+  static writeBytes(path: string, bytes: Uint8Array): void {
+    FileSystem.ensureDir(FileSystem.dirOf(path));
+    const file: fs.File = fs.openSync(path, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE | fs.OpenMode.TRUNC);
+    try {
+      // 按实际视图（byteOffset/byteLength）写入，避免底层 buffer 为大池子视图时写多余字节
+      const view: ArrayBuffer = bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.byteLength) as ArrayBuffer;
+      fs.writeSync(file.fd, view);
+    } finally {
+      fs.closeSync(file);
+    }
+  }
+
   /** 读文本（不存在返回空串）。 */
   static readText(path: string): string {
     if (!FileSystem.exists(path)) {