diff --git a/docs/qqbot-bangdream-tsugu-global-refactor-plan.md b/docs/qqbot-bangdream-tsugu-global-refactor-plan.md
index 7015439..d4f4408 100644
--- a/docs/qqbot-bangdream-tsugu-global-refactor-plan.md
+++ b/docs/qqbot-bangdream-tsugu-global-refactor-plan.md
@@ -14,7 +14,7 @@
 ## 当前事实
 
 - Tsugu 源码目录：`src/qqbot/plugins/bangDream/tsugu`
-- TS 文件：初始基线 92；当前 `tsugu` 源码 133
+- TS 文件：初始基线 92；当前 `tsugu` 源码 134
 - 函数节点：481，其中稳定函数 410，匿名/内联回调 71
 - 源码 JSDoc：稳定函数 410/410 已覆盖
 - 变量声明：1896
@@ -300,6 +300,7 @@ export interface TsuguHook {
 - 本地图片烟测已生成查歌 `136`、查活动 `50` 简易背景和真实活动背景图片，证明 provider/repository 第一段迁移后仍能输出非空图片。
 - 已新增 `models/song-resource-repository.ts`，把 `Song` 的歌曲详情、谱面、封面路径、封面完整 URL 和封面缺失时服务器回退下载收口到不依赖 `Song` 类的资源 repository，避免 `song.ts` 继续直接拼 Bestdori API/asset 路径；`song-resource-repository.spec.ts` 覆盖 detail/chart provider 调用、13/40 旧封面批次、273 强制 CN 和封面 fallback 行为，本地 `/查曲 136`、`/查谱面 136 expert` 图片 smoke 输出非空。
 - 已新增 `models/card-resource-repository.ts`，把 `Card` 的详情请求、资源批次目录、图标/插画/trim 图片路径和重图缓存策略收口到 provider-backed repository；`card-resource-repository.spec.ts` 覆盖 `/api/cards` 缓存参数、`9999` 后资源批次、CN 优先资源路径和非 icon 图片 `memoryCache=false`，本地 `/查卡 472` 图片 smoke 输出非空。
+- 已新增 `models/gacha-resource-repository.ts`，把 `Gacha` 的详情请求、首页横幅、screen 背景、`bg1` fallback 和 Logo 资源路径收口到 provider-backed repository；`gacha-resource-repository.spec.ts` 覆盖 `/api/gacha` 缓存参数、CN 优先 screen 路径、横幅缺失回退 Logo 和背景 fallback，本地 `/查卡池 259`、`/抽卡模拟 10 259` 图片 smoke 输出非空。
 - 固化：Windows 下不要用反斜杠测试路径直接调用 Jest pattern，容易出现 `Pattern ... - 0 matches`；指定文件测试统一使用 `pnpm exec jest --runInBand --runTestsByPath test/qqbot/plugins/bangDream/tsugu/<file>.spec.ts ...`，路径用正斜杠。
 
 ### Phase 4：搜索 specification 和 matcher
diff --git a/src/qqbot/plugins/bangDream/tsugu/models/gacha-resource-repository.ts b/src/qqbot/plugins/bangDream/tsugu/models/gacha-resource-repository.ts
new file mode 100644
index 0000000..c4c75a1
--- /dev/null
+++ b/src/qqbot/plugins/bangDream/tsugu/models/gacha-resource-repository.ts
@@ -0,0 +1,141 @@
+import { bangDreamBestdoriProvider } from '@/qqbot/plugins/bangDream/tsugu/data-clients/bestdori-provider';
+import type { BangDreamDataProvider } from '@/qqbot/plugins/bangDream/tsugu/data-clients/data-provider';
+import {
+  getServerByPriority,
+  Server,
+} from '@/qqbot/plugins/bangDream/tsugu/models/server';
+import { globalDefaultServer } from '@/qqbot/plugins/bangDream/tsugu/runtime/config';
+
+export interface GachaResourceSource {
+  bannerAssetBundleName?: string;
+  gachaId: number;
+  publishedAt: Array<number | null>;
+  resourceName: string;
+}
+
+export type GachaScreenImageType = 'background' | 'backgroundFallback' | 'logo';
+
+/** 将服务器枚举值转换为 Bestdori 资源路径中的服务器编码。 */
+function toServerCode(server: Server | undefined): string {
+  return server == null ? 'undefined' : Server[server];
+}
+
+export class GachaResourceRepository {
+  constructor(
+    private readonly provider: BangDreamDataProvider = bangDreamBestdoriProvider,
+  ) {}
+
+  /**
+   * 获取卡池远端详情。
+   *
+   * @param gachaId - 卡池 ID。
+   * @param update - 是否绕过缓存。
+   */
+  async getDetail(
+    gachaId: number,
+    update: boolean = true,
+  ): Promise<Record<string, any>> {
+    return await this.provider.getJson<Record<string, any>>(
+      `/api/gacha/${gachaId}.json`,
+      { cacheTime: update ? 0 : 1 / 0 },
+    );
+  }
+
+  /**
+   * 获取卡池横幅资源路径。
+   *
+   * @param source - 卡池资源来源字段。
+   */
+  getBannerImagePath(source: GachaResourceSource): string | null {
+    if (!source.bannerAssetBundleName) return null;
+    return `/assets/jp/homebanner_rip/${source.bannerAssetBundleName}.png`;
+  }
+
+  /**
+   * 获取卡池 screen 资源路径。
+   *
+   * @param source - 卡池资源来源字段。
+   * @param imageType - screen 图片类型。
+   * @param displayedServerList - 可展示服务器优先级。
+   */
+  getScreenImagePath(
+    source: GachaResourceSource,
+    imageType: GachaScreenImageType,
+    displayedServerList: Server[] = globalDefaultServer,
+  ): string {
+    const serverCode = toServerCode(
+      getServerByPriority(source.publishedAt, displayedServerList),
+    );
+    const fileName =
+      imageType === 'background'
+        ? 'bg'
+        : imageType === 'backgroundFallback'
+          ? 'bg1'
+          : 'logo';
+    return `/assets/${serverCode}/gacha/screen/${source.resourceName}_rip/${fileName}.png`;
+  }
+
+  /**
+   * 下载卡池横幅资源，缺失时回退到 Logo。
+   *
+   * @param source - 卡池资源来源字段。
+   * @param displayedServerList - 可展示服务器优先级。
+   */
+  async getBannerImageBuffer(
+    source: GachaResourceSource,
+    displayedServerList: Server[] = globalDefaultServer,
+  ): Promise<Buffer> {
+    const bannerPath = this.getBannerImagePath(source);
+    if (!bannerPath) {
+      return await this.getLogoImageBuffer(source, displayedServerList);
+    }
+    try {
+      return await this.provider.getAsset(bannerPath, { ignoreError: false });
+    } catch {
+      return await this.getLogoImageBuffer(source, displayedServerList);
+    }
+  }
+
+  /**
+   * 下载卡池背景资源，`bg.png` 缺失时回退到 `bg1.png`。
+   *
+   * @param source - 卡池资源来源字段。
+   * @param displayedServerList - 可展示服务器优先级。
+   */
+  async getBackgroundImageBuffer(
+    source: GachaResourceSource,
+    displayedServerList: Server[] = globalDefaultServer,
+  ): Promise<Buffer> {
+    try {
+      return await this.provider.getAsset(
+        this.getScreenImagePath(source, 'background', displayedServerList),
+        { ignoreError: false },
+      );
+    } catch {
+      return await this.provider.getAsset(
+        this.getScreenImagePath(
+          source,
+          'backgroundFallback',
+          displayedServerList,
+        ),
+      );
+    }
+  }
+
+  /**
+   * 下载卡池 Logo 资源。
+   *
+   * @param source - 卡池资源来源字段。
+   * @param displayedServerList - 可展示服务器优先级。
+   */
+  async getLogoImageBuffer(
+    source: GachaResourceSource,
+    displayedServerList: Server[] = globalDefaultServer,
+  ): Promise<Buffer> {
+    return await this.provider.getAsset(
+      this.getScreenImagePath(source, 'logo', displayedServerList),
+    );
+  }
+}
+
+export const gachaResourceRepository = new GachaResourceRepository();
diff --git a/src/qqbot/plugins/bangDream/tsugu/models/gacha.ts b/src/qqbot/plugins/bangDream/tsugu/models/gacha.ts
index a0b4eae..8021af2 100644
--- a/src/qqbot/plugins/bangDream/tsugu/models/gacha.ts
+++ b/src/qqbot/plugins/bangDream/tsugu/models/gacha.ts
@@ -1,4 +1,3 @@
-import { bangDreamBestdoriProvider } from '@/qqbot/plugins/bangDream/tsugu/data-clients/bestdori-provider';
 import { bangDreamMainDataRepository } from '@/qqbot/plugins/bangDream/tsugu/models/main-data-repository';
 import { Image, loadImage } from 'skia-canvas';
 import {
@@ -7,14 +6,13 @@ import {
   serverList,
 } from '@/qqbot/plugins/bangDream/tsugu/models/server';
 import { getPresentEvent } from '@/qqbot/plugins/bangDream/tsugu/models/event';
-import {
-  globalDefaultServer,
-} from '@/qqbot/plugins/bangDream/tsugu/runtime/config';
+import { globalDefaultServer } from '@/qqbot/plugins/bangDream/tsugu/runtime/config';
 import { BANGDREAM_GACHA_TYPE_NAME } from '@/qqbot/plugins/bangDream/tsugu/models/bangdream-constants';
 import {
   isFreeGachaType,
   isPermanentJapaneseGachaPeriod,
 } from '@/qqbot/plugins/bangDream/tsugu/models/gacha-policy';
+import { gachaResourceRepository } from '@/qqbot/plugins/bangDream/tsugu/models/gacha-resource-repository';
 
 const gachaDataCache = {};
 
@@ -81,10 +79,9 @@ export class Gacha {
    */
   constructor(gachaId: number) {
     this.gachaId = gachaId;
-    const gachaData = bangDreamMainDataRepository.getEntity<Record<string, any>>(
-      'gacha',
-      gachaId,
-    );
+    const gachaData = bangDreamMainDataRepository.getEntity<
+      Record<string, any>
+    >('gacha', gachaId);
     if (gachaData == undefined) {
       this.isExist = false;
       return;
@@ -147,14 +144,7 @@ export class Gacha {
    * @param update - update参数，未传入时使用默认值。
    */
   async getData(update: boolean = true) {
-    const time = update ? 0 : 1 / 0;
-    const gachaData = await bangDreamBestdoriProvider.getJson<
-      Record<string, any>
-    >(
-      `/api/gacha/${this.gachaId}.json`,
-      { cacheTime: time },
-    );
-    return gachaData;
+    return await gachaResourceRepository.getDetail(this.gachaId, update);
   }
   /**
    * 在 Gacha 模型中获取横幅图片。
@@ -162,16 +152,9 @@ export class Gacha {
    * @returns 异步处理结果。
    */
   async getBannerImage(): Promise<Image> {
-    try {
-      if (this.bannerAssetBundleName == undefined) return this.getGachaLogo();
-      const BannerImageBuffer = await bangDreamBestdoriProvider.getAsset(
-        `/assets/jp/homebanner_rip/${this.bannerAssetBundleName}.png`,
-        { ignoreError: false },
-      );
-      return await loadImage(BannerImageBuffer);
-    } catch {
-      return this.getGachaLogo();
-    }
+    const bannerImageBuffer =
+      await gachaResourceRepository.getBannerImageBuffer(this);
+    return await loadImage(bannerImageBuffer);
   }
   /**
    * 在 Gacha 模型中获取卡池背景图片。
@@ -183,19 +166,12 @@ export class Gacha {
     displayedServerList: Server[] = globalDefaultServer,
   ): Promise<Image> {
     if (!displayedServerList) displayedServerList = globalDefaultServer;
-    const server = getServerByPriority(this.publishedAt);
-    let BGImageBuffer: Buffer;
-    try {
-      BGImageBuffer = await bangDreamBestdoriProvider.getAsset(
-        `/assets/${Server[server]}/gacha/screen/${this.resourceName}_rip/bg.png`,
-        { ignoreError: false },
+    const backgroundImageBuffer =
+      await gachaResourceRepository.getBackgroundImageBuffer(
+        this,
+        displayedServerList,
       );
-    } catch {
-      BGImageBuffer = await bangDreamBestdoriProvider.getAsset(
-        `/assets/${Server[server]}/gacha/screen/${this.resourceName}_rip/bg1.png`,
-      );
-    }
-    return await loadImage(BGImageBuffer);
+    return await loadImage(backgroundImageBuffer);
   }
   /**
    * 在 Gacha 模型中获取卡池Logo。
@@ -207,11 +183,11 @@ export class Gacha {
     displayedServerList: Server[] = globalDefaultServer,
   ): Promise<Image> {
     if (!displayedServerList) displayedServerList = globalDefaultServer;
-    const server = getServerByPriority(this.publishedAt);
-    const LogoImageBuffer = await bangDreamBestdoriProvider.getAsset(
-      `/assets/${Server[server]}/gacha/screen/${this.resourceName}_rip/logo.png`,
+    const logoImageBuffer = await gachaResourceRepository.getLogoImageBuffer(
+      this,
+      displayedServerList,
     );
-    return await loadImage(LogoImageBuffer);
+    return await loadImage(logoImageBuffer);
   }
   /**
    * 在 Gacha 模型中获取活动ID。
diff --git a/test/qqbot/plugins/bangDream/tsugu/gacha-resource-repository.spec.ts b/test/qqbot/plugins/bangDream/tsugu/gacha-resource-repository.spec.ts
new file mode 100644
index 0000000..244405e
--- /dev/null
+++ b/test/qqbot/plugins/bangDream/tsugu/gacha-resource-repository.spec.ts
@@ -0,0 +1,140 @@
+import type { BangDreamDataProvider } from '@/qqbot/plugins/bangDream/tsugu/data-clients/data-provider';
+import {
+  GachaResourceRepository,
+  type GachaResourceSource,
+} from '@/qqbot/plugins/bangDream/tsugu/models/gacha-resource-repository';
+import { Server } from '@/qqbot/plugins/bangDream/tsugu/models/server';
+
+function createProviderMock(): jest.Mocked<BangDreamDataProvider> {
+  return {
+    getAsset: jest.fn(),
+    getJson: jest.fn(),
+    getTracker: jest.fn(),
+    name: 'MockBestdori',
+    resolveUrl: jest.fn((pathOrUrl) => `https://bestdori.example${pathOrUrl}`),
+  };
+}
+
+function createGachaSource(
+  overrides: Partial<GachaResourceSource> = {},
+): GachaResourceSource {
+  return {
+    bannerAssetBundleName: 'banner_gacha0259',
+    gachaId: 259,
+    publishedAt: [100, null, null, 200, null],
+    resourceName: 'gacha0259',
+    ...overrides,
+  };
+}
+
+describe('BangDream gacha resource repository', () => {
+  it('routes gacha detail requests through the provider with explicit cache policy', async () => {
+    const provider = createProviderMock();
+    provider.getJson.mockResolvedValue({ ok: true });
+    const repository = new GachaResourceRepository(provider);
+
+    await expect(repository.getDetail(259, true)).resolves.toEqual({
+      ok: true,
+    });
+    await expect(repository.getDetail(259, false)).resolves.toEqual({
+      ok: true,
+    });
+
+    expect(provider.getJson).toHaveBeenNthCalledWith(1, '/api/gacha/259.json', {
+      cacheTime: 0,
+    });
+    expect(provider.getJson).toHaveBeenNthCalledWith(2, '/api/gacha/259.json', {
+      cacheTime: Infinity,
+    });
+  });
+
+  it('builds banner, background, fallback background, and logo paths', () => {
+    const repository = new GachaResourceRepository(createProviderMock());
+    const source = createGachaSource();
+    const serverPriority = [Server.cn, Server.jp];
+
+    expect(repository.getBannerImagePath(source)).toBe(
+      '/assets/jp/homebanner_rip/banner_gacha0259.png',
+    );
+    expect(
+      repository.getScreenImagePath(source, 'background', serverPriority),
+    ).toBe('/assets/cn/gacha/screen/gacha0259_rip/bg.png');
+    expect(
+      repository.getScreenImagePath(
+        source,
+        'backgroundFallback',
+        serverPriority,
+      ),
+    ).toBe('/assets/cn/gacha/screen/gacha0259_rip/bg1.png');
+    expect(repository.getScreenImagePath(source, 'logo', serverPriority)).toBe(
+      '/assets/cn/gacha/screen/gacha0259_rip/logo.png',
+    );
+  });
+
+  it('falls back to logo when the banner is missing or unavailable', async () => {
+    const provider = createProviderMock();
+    const logoBuffer = Buffer.from('logo');
+    provider.getAsset.mockResolvedValue(logoBuffer);
+    const repository = new GachaResourceRepository(provider);
+
+    await expect(
+      repository.getBannerImageBuffer(
+        createGachaSource({ bannerAssetBundleName: undefined }),
+        [Server.cn, Server.jp],
+      ),
+    ).resolves.toBe(logoBuffer);
+
+    expect(provider.getAsset).toHaveBeenNthCalledWith(
+      1,
+      '/assets/cn/gacha/screen/gacha0259_rip/logo.png',
+    );
+
+    provider.getAsset.mockReset();
+    provider.getAsset
+      .mockRejectedValueOnce(new Error('banner missing'))
+      .mockResolvedValueOnce(logoBuffer);
+
+    await expect(
+      repository.getBannerImageBuffer(createGachaSource(), [
+        Server.cn,
+        Server.jp,
+      ]),
+    ).resolves.toBe(logoBuffer);
+
+    expect(provider.getAsset).toHaveBeenNthCalledWith(
+      1,
+      '/assets/jp/homebanner_rip/banner_gacha0259.png',
+      { ignoreError: false },
+    );
+    expect(provider.getAsset).toHaveBeenNthCalledWith(
+      2,
+      '/assets/cn/gacha/screen/gacha0259_rip/logo.png',
+    );
+  });
+
+  it('falls back from bg.png to bg1.png for gacha backgrounds', async () => {
+    const provider = createProviderMock();
+    const fallbackBuffer = Buffer.from('bg1');
+    provider.getAsset
+      .mockRejectedValueOnce(new Error('background missing'))
+      .mockResolvedValueOnce(fallbackBuffer);
+    const repository = new GachaResourceRepository(provider);
+
+    await expect(
+      repository.getBackgroundImageBuffer(createGachaSource(), [
+        Server.cn,
+        Server.jp,
+      ]),
+    ).resolves.toBe(fallbackBuffer);
+
+    expect(provider.getAsset).toHaveBeenNthCalledWith(
+      1,
+      '/assets/cn/gacha/screen/gacha0259_rip/bg.png',
+      { ignoreError: false },
+    );
+    expect(provider.getAsset).toHaveBeenNthCalledWith(
+      2,
+      '/assets/cn/gacha/screen/gacha0259_rip/bg1.png',
+    );
+  });
+});