diff --git a/apps/viewer/src/__tests__/ad-carousel.spec.ts b/apps/viewer/src/__tests__/ad-carousel.spec.ts
new file mode 100644
index 0000000..3896599
--- /dev/null
+++ b/apps/viewer/src/__tests__/ad-carousel.spec.ts
@@ -0,0 +1,113 @@
+import { mount, type VueWrapper } from '@vue/test-utils';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import type { PublicAd } from '../api/client';
+import { createViewerI18n } from '../i18n';
+import AdCarousel from '../components/ads/AdCarousel.vue';
+
+// 广告轮播组件（Task 10 Step 3）：圆点跳页、关闭 emit、slide 点击新标签打开、
+// 4s 自动轮播与指针悬停暂停、单条静态（无圆点）。会话级关闭记忆在 ActivityPage
+//（组件只 emit close，无 sessionStorage 副作用）。
+
+function makeAd(id: string): PublicAd {
+  return { adId: id, imageUrl: `https://ad.test/${id}.jpg`, linkUrl: `https://link.test/${id}` };
+}
+
+const ADS = [makeAd('a'), makeAd('b'), makeAd('c')];
+
+const mounted: VueWrapper[] = [];
+
+/** window.open 桩（记录调用即可）：经工厂推导 spy 类型，绕开 spyOn 泛型约束。 */
+function spyWindowOpen() {
+  return vi.spyOn(window, 'open').mockReturnValue({} as Window);
+}
+
+function mountCarousel(ads: PublicAd[] = ADS): VueWrapper {
+  const wrapper = mount(AdCarousel, {
+    props: { ads },
+    global: { plugins: [createViewerI18n('zh-CN')] },
+  });
+  mounted.push(wrapper);
+  return wrapper;
+}
+
+function currentSrc(wrapper: VueWrapper): string | null {
+  const img = wrapper.find('.ad-slide img').element as HTMLImageElement | undefined;
+  return img?.getAttribute('src') ?? null;
+}
+
+describe('AdCarousel', () => {
+  let openSpy: ReturnType<typeof spyWindowOpen>;
+
+  beforeEach(() => {
+    vi.useFakeTimers();
+    openSpy = spyWindowOpen();
+  });
+
+  afterEach(() => {
+    openSpy.mockRestore();
+    while (mounted.length > 0) mounted.pop()?.unmount();
+    vi.useRealTimers();
+  });
+
+  it('renders the ad badge and switches to the clicked dot', async () => {
+    const wrapper = mountCarousel();
+    expect(wrapper.get('.ad-badge').text()).toBe('广告');
+    expect(currentSrc(wrapper)).toBe('https://ad.test/a.jpg');
+
+    const dots = wrapper.findAll('.ad-dots button');
+    expect(dots.length).toBe(3);
+    await dots[1].trigger('click');
+    expect(currentSrc(wrapper)).toBe('https://ad.test/b.jpg');
+    expect(dots[1].classes()).toContain('ad-dot--active');
+  });
+
+  it('emits close when the ✕ button is clicked', async () => {
+    const wrapper = mountCarousel();
+    const close = wrapper.get('.ad-close');
+    expect(close.attributes('aria-label')).toBe('关闭广告');
+    await close.trigger('click');
+    expect(wrapper.emitted('close')?.length).toBe(1);
+  });
+
+  it('opens the current ad link in a new tab via window.open', async () => {
+    const wrapper = mountCarousel();
+    await wrapper.get('.ad-slide').trigger('click');
+    expect(openSpy).toHaveBeenCalledWith('https://link.test/a', '_blank', 'noopener,noreferrer');
+  });
+
+  it('auto-advances every 4s, pauses on pointer enter and resumes on leave', async () => {
+    const wrapper = mountCarousel();
+    expect(currentSrc(wrapper)).toBe('https://ad.test/a.jpg');
+
+    await vi.advanceTimersByTimeAsync(4000);
+    expect(currentSrc(wrapper)).toBe('https://ad.test/b.jpg');
+
+    await wrapper.find('.ad-carousel').trigger('pointerenter');
+    await vi.advanceTimersByTimeAsync(8000);
+    expect(currentSrc(wrapper)).toBe('https://ad.test/b.jpg'); // 悬停期间不切换
+
+    await wrapper.find('.ad-carousel').trigger('pointerleave');
+    await vi.advanceTimersByTimeAsync(4000);
+    expect(currentSrc(wrapper)).toBe('https://ad.test/c.jpg'); // 离开自动恢复
+  });
+
+  it('switches by horizontal swipe (touch) and cancels the synthetic click', async () => {
+    const wrapper = mountCarousel();
+    const root = wrapper.find('.ad-carousel');
+    await root.trigger('touchstart', { touches: [{ clientX: 200, clientY: 20 }] });
+    await root.trigger('touchend', { changedTouches: [{ clientX: 80, clientY: 25 }] });
+    expect(currentSrc(wrapper)).toBe('https://ad.test/b.jpg'); // 左滑 → 下一张
+    expect(openSpy).not.toHaveBeenCalled(); // 滑动不触发广告打开
+
+    await root.trigger('touchstart', { touches: [{ clientX: 100, clientY: 10 }] });
+    await root.trigger('touchend', { changedTouches: [{ clientX: 190, clientY: 12 }] });
+    expect(currentSrc(wrapper)).toBe('https://ad.test/a.jpg'); // 右滑 → 上一张
+  });
+
+  it('renders a single ad statically without dots or auto rotation', async () => {
+    const wrapper = mountCarousel([makeAd('solo')]);
+    expect(wrapper.find('.ad-dots').exists()).toBe(false);
+    await vi.advanceTimersByTimeAsync(12000);
+    expect(currentSrc(wrapper)).toBe('https://ad.test/solo.jpg');
+  });
+});
diff --git a/apps/viewer/src/ads/carousel.spec.ts b/apps/viewer/src/ads/carousel.spec.ts
new file mode 100644
index 0000000..7bcd934
--- /dev/null
+++ b/apps/viewer/src/ads/carousel.spec.ts
@@ -0,0 +1,48 @@
+import { describe, expect, it } from 'vitest';
+import { nextIndex, swipeStep } from './carousel';
+
+// 广告轮播纯逻辑（Task 10 Step 1）：推进/环形回绕/单条静止 + 滑动手势判定
+//（阈值 40px、水平分量须严格大于垂直分量）。
+
+describe('nextIndex', () => {
+  it('advances forward and wraps from the tail to the head (ring)', () => {
+    expect(nextIndex(3, 0)).toBe(1);
+    expect(nextIndex(3, 1)).toBe(2);
+    expect(nextIndex(3, 2)).toBe(0); // 末→首
+  });
+
+  it('keeps a single item pinned at 0 (never switches)', () => {
+    expect(nextIndex(1, 0)).toBe(0);
+    expect(nextIndex(1, 0, -1)).toBe(0);
+    expect(nextIndex(0, 0)).toBe(0); // 空表防御：同 0
+  });
+
+  it('steps backwards wrapping from the head to the tail', () => {
+    expect(nextIndex(3, 0, -1)).toBe(2);
+    expect(nextIndex(3, 2, -1)).toBe(1);
+    expect(nextIndex(5, 4, -1)).toBe(3);
+  });
+});
+
+describe('swipeStep', () => {
+  it('maps an unambiguous horizontal swipe to its direction', () => {
+    expect(swipeStep(-80, 5)).toBe(1); // 左滑 → 下一张
+    expect(swipeStep(80, -5)).toBe(-1); // 右滑 → 上一张
+  });
+
+  it('ignores movement under the 40px threshold', () => {
+    expect(swipeStep(-39, 0)).toBe(0);
+    expect(swipeStep(39, 2)).toBe(0);
+  });
+
+  it('accepts exactly 40px (>= threshold)', () => {
+    expect(swipeStep(-40, 0)).toBe(1);
+    expect(swipeStep(40, 0)).toBe(-1);
+  });
+
+  it('ignores diagonal or vertically dominant movement', () => {
+    expect(swipeStep(60, 70)).toBe(0); // 垂直分量更大（斜向）
+    expect(swipeStep(50, 50)).toBe(0); // 等分量：水平须严格大于垂直
+    expect(swipeStep(-100, 100)).toBe(0);
+  });
+});
diff --git a/apps/viewer/src/ads/carousel.ts b/apps/viewer/src/ads/carousel.ts
new file mode 100644
index 0000000..5c63141
--- /dev/null
+++ b/apps/viewer/src/ads/carousel.ts
@@ -0,0 +1,16 @@
+/**
+ * 广告轮播纯逻辑（Task 10 Step 1）：推进/环形回绕/滑动手势判定抽为纯函数，
+ * 供 AdCarousel.vue 复用并由本 spec 直测（不依赖组件挂载）。
+ */
+
+/** 轮播推进：环形（末→首）；单条恒 0（不切换）。 */
+export function nextIndex(count: number, current: number, step: 1 | -1 = 1): number {
+  if (count <= 1) return 0;
+  return (current + step + count) % count;
+}
+
+/** 滑动手势判定：水平位移 ≥40px 且水平分量大于垂直分量才视为翻页。 */
+export function swipeStep(dx: number, dy: number): 1 | -1 | 0 {
+  if (Math.abs(dx) < 40 || Math.abs(dx) <= Math.abs(dy)) return 0;
+  return dx < 0 ? 1 : -1;
+}
diff --git a/apps/viewer/src/api/client.ts b/apps/viewer/src/api/client.ts
index 7fca60c..01d337e 100644
--- a/apps/viewer/src/api/client.ts
+++ b/apps/viewer/src/api/client.ts
@@ -22,6 +22,11 @@ export type PublicEmbedAlbum = components['schemas']['PublicEmbedAlbum'];
 export type PublicEmbedPhoto = components['schemas']['PublicEmbedPhoto'];
 export type EmbedSlotSettings = components['schemas']['EmbedSlotSettings'];
 
+// 广告位轮播 Task 10 公开数据类型（ov 域 GET /public/albums/{token}/ads：
+// 全局投放 ∨ 绑定本相册的启用广告，仅展示所需字段）。
+export type PublicAdListResponse = components['schemas']['PublicAdListResponse'];
+export type PublicAd = components['schemas']['PublicAd'];
+
 /** 公开照片排序模式（sort=hot 仅 ov 实现：likeTotal 倒序短期快照，§7）。 */
 export type SortMode = 'latest' | 'hot';
 
@@ -140,6 +145,11 @@ export function getPublicPhoto(token: string, photoId: string, locale?: string):
   );
 }
 
+/** 公开广告列表（Task 10）：无广告返回空 items（非 404）；失败由调用方静默。 */
+export function getPublicAds(token: string): Promise<PublicAdListResponse> {
+  return apiRequest<PublicAdListResponse>(`/public/albums/${encodeURIComponent(token)}/ads`);
+}
+
 /** 点赞批次上报（Task 10）：失败重试必须复用同一 batchId（服务端幂等键）。 */
 export function postLikeBatch(token: string, photoId: string, body: LikeBatchRequest): Promise<LikeBatchResponse> {
   return apiRequest<LikeBatchResponse>(
diff --git a/apps/viewer/src/components/ads/AdCarousel.vue b/apps/viewer/src/components/ads/AdCarousel.vue
new file mode 100644
index 0000000..2111e2e
--- /dev/null
+++ b/apps/viewer/src/components/ads/AdCarousel.vue
@@ -0,0 +1,197 @@
+<script setup lang="ts">
+import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue';
+import { useI18n } from 'vue-i18n';
+import type { PublicAd } from '../../api/client';
+import { nextIndex, swipeStep } from '../../ads/carousel';
+
+// 广告位轮播（Task 10 Step 3）：相册头部 10:3 轮播。4s 自动推进（本地常量，
+// 不入契约）；pointerenter/pointerdown 暂停、pointerleave 恢复（恢复重开完整
+// 4s 窗口）；圆点跳页；移动端水平滑动翻页（swipeStep，滑动 cancel 合成 click
+// 不打开广告）；单条=静态（无圆点无自动切换）。左上角常驻「广告」徽标（合规
+// 可识别性，随轮播恒可见）。组件无副作用：会话级关闭记忆（sessionStorage）在
+// ActivityPage——此处只 emit close。
+
+/** 自动轮播间隔（本地常量；服务端契约不含节奏，前端自治）。 */
+const ROTATE_MS = 4000;
+
+const props = defineProps<{ ads: PublicAd[] }>();
+const emit = defineEmits<{ close: [] }>();
+
+const { t } = useI18n();
+
+const current = ref(0);
+const currentAd = computed(() => props.ads[current.value] ?? null);
+/** 指针悬停/按住期间暂停（恢复时重开完整 4s 窗口，非冻结剩余时长）。 */
+const paused = ref(false);
+
+let rotateTimer: ReturnType<typeof setInterval> | undefined;
+
+function stopRotation(): void {
+  if (rotateTimer !== undefined) {
+    clearInterval(rotateTimer);
+    rotateTimer = undefined;
+  }
+}
+
+/** 按当前状态（条数/暂停）对齐定时器：多条件变化共用的一个收敛点。 */
+function syncRotation(): void {
+  stopRotation();
+  if (props.ads.length <= 1 || paused.value) return;
+  rotateTimer = setInterval(() => {
+    current.value = nextIndex(props.ads.length, current.value);
+  }, ROTATE_MS);
+}
+
+/** 跳页（圆点/滑动共用）：就位后重开完整 4s 窗口。 */
+function goTo(index: number): void {
+  current.value = index;
+  syncRotation();
+}
+
+function stepBy(step: 1 | -1): void {
+  goTo(nextIndex(props.ads.length, current.value, step));
+}
+
+/** 新广告列表（token/locale 重载整表替换）→ 回首项并重对齐轮播。 */
+watch(
+  () => props.ads,
+  () => {
+    current.value = 0;
+    syncRotation();
+  },
+);
+watch(paused, syncRotation);
+onMounted(syncRotation);
+onBeforeUnmount(stopRotation);
+
+let touchStart: { x: number; y: number } | null = null;
+
+function onTouchStart(event: TouchEvent): void {
+  const touch = event.touches[0];
+  if (touch !== undefined) touchStart = { x: touch.clientX, y: touch.clientY };
+}
+
+function onTouchEnd(event: TouchEvent): void {
+  if (touchStart === null) return;
+  const start = touchStart;
+  touchStart = null;
+  const touch = event.changedTouches[0];
+  if (touch === undefined) return;
+  const step = swipeStep(touch.clientX - start.x, touch.clientY - start.y);
+  if (step === 0) return;
+  // 滑动判定成立：取消随后合成的 click（翻页不打开广告链接）。
+  event.preventDefault();
+  stepBy(step);
+}
+
+function openAd(ad: PublicAd): void {
+  // noopener/noreferrer：新标签不持有 opener（与 useDownload/EmbedPage 同规）。
+  window.open(ad.linkUrl, '_blank', 'noopener,noreferrer');
+}
+</script>
+
+<template>
+  <!-- aria-live=off：轮播自动切换不应打扰读屏（用户主动操作经按钮语义可达）。 -->
+  <section
+    class="ad-carousel" role="region" :aria-label="t('ads.label')" aria-live="off"
+    @pointerenter="paused = true" @pointerdown="paused = true" @pointerleave="paused = false"
+    @touchstart="onTouchStart" @touchend="onTouchEnd"
+  >
+    <button
+      v-if="currentAd !== null" type="button" class="ad-slide" :aria-label="t('ads.open')"
+      @click="openAd(currentAd)"
+    >
+      <img :src="currentAd.imageUrl" :alt="t('ads.label')" loading="lazy" draggable="false">
+    </button>
+    <span class="ad-badge">{{ t('ads.label') }}</span>
+    <button type="button" class="ad-close" :aria-label="t('ads.close')" @click="emit('close')">✕</button>
+    <nav v-if="ads.length > 1" class="ad-dots" :aria-label="t('ads.dots')">
+      <button
+        v-for="(ad, i) in ads" :key="ad.adId" type="button" class="ad-dot"
+        :class="{ 'ad-dot--active': i === current }" :aria-label="t('ads.goto', { n: i + 1 })"
+        @click="goTo(i)"
+      />
+    </nav>
+  </section>
+</template>
+
+<style scoped>
+/* 视觉 token 一律 var(--viewer-*)（UI-02 §3.1）；半透明层经 color-mix 自 token
+ * 派生（不写死色值、不扩 token 作用域文件）。 */
+.ad-carousel {
+  position: relative;
+  width: 100%;
+  aspect-ratio: 10 / 3; /* 建议素材 1200×360 */
+  margin-bottom: 16px;
+  overflow: hidden;
+  border-radius: var(--viewer-radius-img);
+  background: var(--viewer-dark-bg); /* 图像加载期的暗色衬底 */
+  font-family: var(--viewer-font-family);
+}
+.ad-slide {
+  display: block;
+  width: 100%;
+  height: 100%;
+  padding: 0;
+  border: 0;
+  background: transparent;
+  cursor: pointer;
+}
+.ad-slide img {
+  display: block;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+.ad-badge {
+  position: absolute;
+  top: 8px;
+  left: 8px;
+  padding: 2px 10px;
+  border-radius: var(--viewer-radius-pill);
+  font-size: 12px;
+  line-height: 18px;
+  color: var(--viewer-surface);
+  background: color-mix(in srgb, var(--viewer-dark-bg) 72%, transparent);
+  pointer-events: none; /* 徽标不拦截 slide 点击 */
+}
+.ad-close {
+  position: absolute;
+  top: 0;
+  right: 0;
+  width: var(--viewer-touch-target); /* ≥44px 触达 */
+  height: var(--viewer-touch-target);
+  border: 0;
+  border-radius: 50%;
+  font-size: 18px;
+  line-height: 1;
+  color: var(--viewer-surface);
+  background: color-mix(in srgb, var(--viewer-dark-bg) 72%, transparent);
+  cursor: pointer;
+}
+.ad-dots {
+  position: absolute;
+  bottom: 10px;
+  left: 50%;
+  transform: translateX(-50%);
+  display: flex;
+  gap: 4px;
+}
+.ad-dot {
+  padding: 8px; /* 8px 视觉圆点 + 8px 外扩 = 24px 命中区 */
+  border: 0;
+  background: transparent;
+  cursor: pointer;
+}
+.ad-dot::before {
+  content: '';
+  display: block;
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  background: color-mix(in srgb, var(--viewer-surface) 55%, transparent);
+}
+.ad-dot--active::before {
+  background: var(--viewer-surface);
+}
+</style>
diff --git a/apps/viewer/src/i18n/locales/en.ts b/apps/viewer/src/i18n/locales/en.ts
index ef0cc7b..b13ab74 100644
--- a/apps/viewer/src/i18n/locales/en.ts
+++ b/apps/viewer/src/i18n/locales/en.ts
@@ -19,6 +19,14 @@ export default {
   },
   lang: { switch: 'Switch language' },
   prefs: { reduceMotion: 'Reduce motion' },
+  // Ad carousel (Task 10): badge text = label (compliance, always visible).
+  ads: {
+    label: 'Ad',
+    close: 'Close ads',
+    open: 'Open ad link',
+    dots: 'Carousel position',
+    goto: 'Go to {n}',
+  },
   // Embed carousel iframe page (P4b Task 4): subset driven by the lang query.
   embed: {
     comingSoon: 'Photos coming soon',
diff --git a/apps/viewer/src/i18n/locales/zh-CN.ts b/apps/viewer/src/i18n/locales/zh-CN.ts
index e2810b2..07c6958 100644
--- a/apps/viewer/src/i18n/locales/zh-CN.ts
+++ b/apps/viewer/src/i18n/locales/zh-CN.ts
@@ -19,6 +19,14 @@ export default {
   },
   lang: { switch: '切换语言' },
   prefs: { reduceMotion: '减少动画' },
+  // 广告位轮播（Task 10）：徽标文案=label（合规可识别性，随轮播恒可见）。
+  ads: {
+    label: '广告',
+    close: '关闭广告',
+    open: '打开广告链接',
+    dots: '轮播位置',
+    goto: '第 {n} 张',
+  },
   // 嵌入轮播 iframe 页（P4b Task 4；UI-01 补全）：独立于宿主语言的词条子集
   // （lang 查询驱动）。图片无真实描述时只给上下文标签（§5.3 不编造画面）。
   embed: {
diff --git a/apps/viewer/src/pages/ActivityPage.vue b/apps/viewer/src/pages/ActivityPage.vue
index 8f44a12..3d69d19 100644
--- a/apps/viewer/src/pages/ActivityPage.vue
+++ b/apps/viewer/src/pages/ActivityPage.vue
@@ -5,14 +5,17 @@ import { useRoute, useRouter } from 'vue-router';
 import {
   ApiError,
   NETWORK_ERROR_CODE,
+  getPublicAds,
   getPublicAlbum,
   getPublicPhoto,
   getPublicPhotos,
+  type PublicAd,
   type PublicAlbum,
   type SortMode,
 } from '../api/client';
 import { errorMessageKey } from '../api/errors';
 import { useDownload } from '../download/useDownload';
+import AdCarousel from '../components/ads/AdCarousel.vue';
 import AlbumHeader from '../components/album/AlbumHeader.vue';
 import LikeBubbles from '../components/LikeBubbles.vue';
 import PhotoFeed from '../components/PhotoFeed.vue';
@@ -56,6 +59,8 @@ const loadErrorKey = ref<string | null>(null);
 const loading = ref(true);
 /** 相册浏览数（Task 10）：album 加载初值 + 上报确认/ stats.updated 校准。 */
 const viewCount = ref<number | null>(null);
+/** 广告位轮播数据（Task 10）：相册加载成功后独立拉取；关闭为会话级记忆。 */
+const ads = ref<PublicAd[]>([]);
 
 // 快速连续切换语言/路由时的竞态防护：仅最新请求的结果可落地。
 let loadSequence = 0;
@@ -69,6 +74,20 @@ async function load(): Promise<void> {
     album.value = data;
     loadErrorKey.value = null;
     viewCount.value = data.viewCount;
+    // 广告独立拉取（Task 10）：失败静默（广告缺席不阻塞相册浏览）；会话级
+    // 关闭记忆先行（命中则连请求都省）。沿用 sequence 防跨相册竞态落地。
+    ads.value = [];
+    if (sessionStorage.getItem('viewer:ads-dismissed') !== '1') {
+      getPublicAds(token.value)
+        .then((result) => {
+          if (sequence !== loadSequence) return;
+          ads.value = result.items;
+        })
+        .catch(() => {
+          if (sequence !== loadSequence) return;
+          ads.value = [];
+        });
+    }
     // 浏览上报（Task 10）：加载成功后（可见时）一次性上报——幂等键由 reporter
     // 持久，窗口内刷新不重复计数（A14）。
     visitReport.notifyAlbumLoaded();
@@ -101,6 +120,12 @@ function selectCategory(categoryId: string | null): void {
   selectedCategory.value = categoryId;
 }
 
+/** 关闭广告（Task 10）：会话级记忆（本次会话不再拉取/渲染），组件只 emit。 */
+function dismissAds(): void {
+  sessionStorage.setItem('viewer:ads-dismissed', '1');
+  ads.value = [];
+}
+
 // —— 照片序列（Task 8 提升：feed + lightbox 共享） ——
 
 /** 排序模式（Task 10）：latest=发布倒序（缺省）/ hot=点赞倒序短期快照。
@@ -340,6 +365,9 @@ onBeforeUnmount(() => {
         @select-category="selectCategory"
       />
 
+      <!-- 广告位轮播（Task 10）：相册头部之下；拉取失败/会话级关闭时整块缺席。 -->
+      <AdCarousel v-if="ads.length > 0" :ads="ads" @close="dismissAds" />
+
       <!-- 深链目标不可见（404 防枚举同码）：页内本地化提示 + 返回相册。 -->
       <div v-if="deepLinkNotFound || deepLinkErrorKey !== null" class="deep-link-notice" role="alert">
         <p>{{ deepLinkNotFound ? t('viewer.photoUnavailable') : t(deepLinkErrorKey ?? 'errors.unknown') }}</p>