diff --git a/src/modules/qqbot/plugin-platform/infrastructure/integration/runtime/builtin-plugin-worker.thread.ts b/src/modules/qqbot/plugin-platform/infrastructure/integration/runtime/builtin-plugin-worker.thread.ts
index 07af9b9..f3cfa03 100644
--- a/src/modules/qqbot/plugin-platform/infrastructure/integration/runtime/builtin-plugin-worker.thread.ts
+++ b/src/modules/qqbot/plugin-platform/infrastructure/integration/runtime/builtin-plugin-worker.thread.ts
@@ -1,5 +1,11 @@
-import { existsSync, readFileSync, writeFileSync } from 'node:fs';
-import { join } from 'node:path';
+import {
+  existsSync,
+  mkdirSync,
+  readFileSync,
+  renameSync,
+  writeFileSync,
+} from 'node:fs';
+import { dirname, join } from 'node:path';
 import { parentPort, workerData } from 'node:worker_threads';
 import * as XLSX from 'xlsx';
 import type {
@@ -330,6 +336,10 @@ function createBangDreamRuntimeIo(): BangDreamRuntimeIo {
     readExcelRows: async (filePath) => readExcelRows(filePath),
     readJsonFile: async (filePath) => readJsonFile(filePath),
     readJsonFileSync: (filePath) => readJsonFile(filePath),
+    renameFile: async (from, to) => {
+      mkdirSync(dirname(to), { recursive: true });
+      renameSync(from, to);
+    },
     requestArrayBuffer: async (url, options) => ({
       body: Buffer.from(
         await callHost<Uint8Array>('requestBuffer', {
@@ -361,8 +371,10 @@ function createBangDreamRuntimeIo(): BangDreamRuntimeIo {
     }),
     sleep: async (ms) =>
       await new Promise((resolve) => setTimeout(resolve, ms)),
-    writeJsonFile: async (filePath, data) =>
-      writeFileSync(filePath, JSON.stringify(data)),
+    writeJsonFile: async (filePath, data) => {
+      mkdirSync(dirname(filePath), { recursive: true });
+      writeFileSync(filePath, JSON.stringify(data));
+    },
   };
 }
 
diff --git a/src/modules/qqbot/plugins/bangdream/plugin.json b/src/modules/qqbot/plugins/bangdream/plugin.json
index cea5ba7..1754ffd 100644
--- a/src/modules/qqbot/plugins/bangdream/plugin.json
+++ b/src/modules/qqbot/plugins/bangdream/plugin.json
@@ -13,7 +13,8 @@
     "runtime.http",
     "asset.read",
     "plugin.config.read",
-    "plugin.storage.read"
+    "plugin.storage.read",
+    "plugin.storage.write"
   ],
   "runtime": {
     "workerType": "node-worker",
@@ -257,6 +258,22 @@
       "timeoutMs": 30000
     }
   ],
+  "tasks": [
+    {
+      "key": "bangdream.bestdori.sync-main-data",
+      "name": "同步 Bestdori 主数据",
+      "handlerName": "syncBestdoriMainData",
+      "description": "同步 BangDream 重命令依赖的 Bestdori JSON 主数据。",
+      "defaultCron": "0 */6 * * *",
+      "enabled": true,
+      "timeoutMs": 120000,
+      "permissions": [
+        "runtime.http",
+        "plugin.storage.read",
+        "plugin.storage.write"
+      ]
+    }
+  ],
   "events": [],
   "assets": [
     {
diff --git a/src/modules/qqbot/plugins/bangdream/src/application/catalog/bangdream-catalog-cache.ts b/src/modules/qqbot/plugins/bangdream/src/application/catalog/bangdream-catalog-cache.ts
index 878e79f..85245e8 100644
--- a/src/modules/qqbot/plugins/bangdream/src/application/catalog/bangdream-catalog-cache.ts
+++ b/src/modules/qqbot/plugins/bangdream/src/application/catalog/bangdream-catalog-cache.ts
@@ -1,3 +1,4 @@
+import { join } from 'node:path';
 import { bestdoriApiPath } from '@/modules/qqbot/plugins/bangdream/src/config/runtime-config';
 import { bangdreamBestdoriProvider } from '@/modules/qqbot/plugins/bangdream/src/infrastructure/integration/bestdori.provider';
 import { bangdreamStaticPatchProvider } from '@/modules/qqbot/plugins/bangdream/src/infrastructure/storage/static-patch.provider';
@@ -7,6 +8,7 @@ import {
   normalizeBangDreamPositiveInteger,
 } from '@/modules/qqbot/plugins/bangdream/src/config/runtime-options';
 import {
+  readBangDreamJsonFile,
   readBangDreamRuntimeConfig,
   sleepBangDreamRuntime,
 } from '@/modules/qqbot/plugins/bangdream/src/infrastructure/integration/runtime-io';
@@ -82,12 +84,18 @@ async function loadCatalogKey(key: BangDreamCatalogKey, useCache: boolean) {
 
   const promise = (async () => {
     if (useCache) {
-      bangdreamCatalogCache[key] = await bangdreamBestdoriProvider.getJson(
-        bestdoriApiPath[key],
-        {
-          cacheTime: 1 / 0,
-        },
-      );
+      try {
+        bangdreamCatalogCache[key] = await readBangDreamCatalogDataFromCache(
+          key,
+        );
+      } catch {
+        bangdreamCatalogCache[key] = await bangdreamBestdoriProvider.getJson(
+          bestdoriApiPath[key],
+          {
+            cacheTime: 1 / 0,
+          },
+        );
+      }
       return;
     }
 
@@ -184,4 +192,34 @@ export async function waitForBangDreamCatalogReady(
   }
 }
 
+export async function refreshBangDreamCatalogFromCache(
+  keys?: readonly BangDreamCatalogKey[],
+) {
+  const catalogKeys = normalizeCatalogKeys(keys);
+  for (const key of catalogKeys) {
+    bangdreamCatalogCache[key] = {};
+  }
+  await loadCatalogData(catalogKeys, true);
+}
+
+export function resolveBangDreamMainDataCachePath(
+  cacheRoot: string,
+  key: BangDreamCatalogKey,
+) {
+  return join(cacheRoot, 'bestdori', `${key}.json`);
+}
+
+function resolveBangDreamCatalogCacheRoot() {
+  return (
+    readBangDreamRuntimeConfig(BANGDREAM_TSUGU_ENV_KEYS.cacheRoot) ||
+    join(process.cwd(), '.kt-workspace', 'cache', 'bangdream')
+  );
+}
+
+async function readBangDreamCatalogDataFromCache(key: BangDreamCatalogKey) {
+  return readBangDreamJsonFile(
+    resolveBangDreamMainDataCachePath(resolveBangDreamCatalogCacheRoot(), key),
+  );
+}
+
 export default bangdreamCatalogCache;
diff --git a/src/modules/qqbot/plugins/bangdream/src/application/tasks/bestdori-main-data-sync.task.ts b/src/modules/qqbot/plugins/bangdream/src/application/tasks/bestdori-main-data-sync.task.ts
new file mode 100644
index 0000000..365b809
--- /dev/null
+++ b/src/modules/qqbot/plugins/bangdream/src/application/tasks/bestdori-main-data-sync.task.ts
@@ -0,0 +1,119 @@
+import { join } from 'node:path';
+import { bestdoriApiPath, bestdoriUrl } from '../../config/runtime-config';
+import { BANGDREAM_TSUGU_ENV_KEYS } from '../../config/runtime-options';
+import {
+  readBangDreamRuntimeConfig,
+  requestBangDreamJson,
+  writeBangDreamJsonFileAtomic,
+} from '../../infrastructure/integration/runtime-io';
+import {
+  refreshBangDreamCatalogFromCache,
+  resolveBangDreamMainDataCachePath,
+  type BangDreamCatalogKey,
+} from '../catalog/bangdream-catalog-cache';
+
+export const BANGDREAM_BESTDORI_MAIN_DATA_KEYS = [
+  'songs',
+  'meta',
+  'cards',
+  'skills',
+  'events',
+  'gacha',
+  'costumes',
+  'bands',
+  'characters',
+  'areaItems',
+] as const satisfies readonly BangDreamCatalogKey[];
+
+type BangDreamBestdoriMainDataKey =
+  (typeof BANGDREAM_BESTDORI_MAIN_DATA_KEYS)[number];
+
+type BangDreamBestdoriMainDataSyncOutput = {
+  cacheRootConfigured: boolean;
+  durationMs: number;
+  failedCount: number;
+  successCount: number;
+  syncedKeys: BangDreamBestdoriMainDataKey[];
+};
+
+export function createBestdoriMainDataSyncTask() {
+  return {
+    execute: syncBestdoriMainData,
+    handlerName: 'syncBestdoriMainData',
+    key: 'bangdream.bestdori.sync-main-data',
+  };
+}
+
+async function syncBestdoriMainData(
+  input: Record<string, unknown>,
+): Promise<BangDreamBestdoriMainDataSyncOutput> {
+  const startedAt = Date.now();
+  const keys = normalizeKeys(input.keys);
+  const cacheRoot = resolveCacheRoot();
+  const failures: Array<{ key: string; message: string }> = [];
+  const syncedKeys: BangDreamBestdoriMainDataKey[] = [];
+
+  for (const key of keys) {
+    try {
+      const response = await requestBangDreamJson(
+        new URL(bestdoriApiPath[key], bestdoriUrl).toString(),
+        { timeoutMs: 30000 },
+      );
+      await writeBangDreamJsonFileAtomic(
+        resolveBangDreamMainDataCachePath(cacheRoot, key),
+        response.body,
+      );
+      syncedKeys.push(key);
+    } catch (error) {
+      failures.push({
+        key,
+        message: error instanceof Error ? error.message : `${error}`,
+      });
+    }
+  }
+
+  if (syncedKeys.length > 0) {
+    await refreshBangDreamCatalogFromCache(syncedKeys);
+  }
+
+  if (failures.length > 0) {
+    throw new Error(
+      `BangDream Bestdori 主数据同步失败：${failures
+        .map((failure) => `${failure.key}:${failure.message}`)
+        .join('; ')}`,
+    );
+  }
+
+  return {
+    cacheRootConfigured: Boolean(
+      readBangDreamRuntimeConfig(BANGDREAM_TSUGU_ENV_KEYS.cacheRoot),
+    ),
+    durationMs: Date.now() - startedAt,
+    failedCount: failures.length,
+    successCount: syncedKeys.length,
+    syncedKeys,
+  };
+}
+
+function normalizeKeys(input: unknown): BangDreamBestdoriMainDataKey[] {
+  const requested = Array.isArray(input) ? input : [];
+  const allowed = new Set<string>(BANGDREAM_BESTDORI_MAIN_DATA_KEYS);
+  const keys =
+    requested.length > 0
+      ? requested.filter(
+          (key): key is BangDreamBestdoriMainDataKey =>
+            typeof key === 'string' && allowed.has(key),
+        )
+      : BANGDREAM_BESTDORI_MAIN_DATA_KEYS;
+  const uniqueKeys = [...new Set(keys)];
+  return uniqueKeys.length > 0
+    ? uniqueKeys
+    : [...BANGDREAM_BESTDORI_MAIN_DATA_KEYS];
+}
+
+function resolveCacheRoot() {
+  return (
+    readBangDreamRuntimeConfig(BANGDREAM_TSUGU_ENV_KEYS.cacheRoot) ||
+    join(process.cwd(), '.kt-workspace', 'cache', 'bangdream')
+  );
+}
diff --git a/src/modules/qqbot/plugins/bangdream/src/application/tasks/index.ts b/src/modules/qqbot/plugins/bangdream/src/application/tasks/index.ts
new file mode 100644
index 0000000..42df65e
--- /dev/null
+++ b/src/modules/qqbot/plugins/bangdream/src/application/tasks/index.ts
@@ -0,0 +1 @@
+export * from './bestdori-main-data-sync.task';
diff --git a/src/modules/qqbot/plugins/bangdream/src/index.ts b/src/modules/qqbot/plugins/bangdream/src/index.ts
index eeede24..7d07f2b 100644
--- a/src/modules/qqbot/plugins/bangdream/src/index.ts
+++ b/src/modules/qqbot/plugins/bangdream/src/index.ts
@@ -11,6 +11,7 @@ import {
   configureBangDreamRuntimeIo,
   type BangDreamRuntimeIo,
 } from './infrastructure/integration/runtime-io';
+import { createBestdoriMainDataSyncTask } from './application/tasks';
 import {
   getBangDreamOperationsByHandlerName,
   type BangDreamOperationModule,
@@ -58,6 +59,7 @@ export function createPlugin(options: BangDreamPluginRuntimeOptions) {
     createBangDreamOperationLogObserver(),
   ]);
   const operationsByKey = resolveBangDreamOperations(options.operations);
+  const tasks = [createBestdoriMainDataSyncTask()];
   const normalizeError =
     options.normalizeError ||
     ((error: unknown) =>
@@ -120,6 +122,7 @@ export function createPlugin(options: BangDreamPluginRuntimeOptions) {
       execute: async (input: BangDreamCommandInput) =>
         await executeOperation(operation.key, input),
     })),
+    tasks,
     version: options.version || '2.0.0',
   };
 }
diff --git a/src/modules/qqbot/plugins/bangdream/src/infrastructure/integration/runtime-io.ts b/src/modules/qqbot/plugins/bangdream/src/infrastructure/integration/runtime-io.ts
index 55ac5a8..ec313d9 100644
--- a/src/modules/qqbot/plugins/bangdream/src/infrastructure/integration/runtime-io.ts
+++ b/src/modules/qqbot/plugins/bangdream/src/infrastructure/integration/runtime-io.ts
@@ -6,6 +6,7 @@ export type BangDreamRuntimeIo = {
   ) => Promise<T[]>;
   readJsonFile?: <T = unknown>(filePath: string) => Promise<T>;
   readJsonFileSync?: <T = unknown>(filePath: string) => T;
+  renameFile?: (from: string, to: string) => Promise<void>;
   requestArrayBuffer?: (
     url: string,
     options?: {
@@ -111,6 +112,18 @@ export async function writeBangDreamJsonFile(filePath: string, data: unknown) {
   await runtimeIo.writeJsonFile(filePath, data);
 }
 
+export async function writeBangDreamJsonFileAtomic(
+  filePath: string,
+  data: unknown,
+) {
+  if (!runtimeIo.writeJsonFile || !runtimeIo.renameFile) {
+    throw new Error('BangDream JSON 原子写入器未初始化');
+  }
+  const tempPath = `${filePath}.${process.pid}.${Date.now()}.tmp`;
+  await runtimeIo.writeJsonFile(tempPath, data);
+  await runtimeIo.renameFile(tempPath, filePath);
+}
+
 export async function sleepBangDreamRuntime(ms: number) {
   if (ms <= 0) return;
   if (runtimeIo.sleep) {
diff --git a/test/modules/qqbot/plugins/bangdream/bestdori-main-data-sync.task.spec.ts b/test/modules/qqbot/plugins/bangdream/bestdori-main-data-sync.task.spec.ts
new file mode 100644
index 0000000..473e5d8
--- /dev/null
+++ b/test/modules/qqbot/plugins/bangdream/bestdori-main-data-sync.task.spec.ts
@@ -0,0 +1,110 @@
+import {
+  existsSync,
+  mkdirSync,
+  mkdtempSync,
+  readFileSync,
+  renameSync,
+  rmSync,
+  writeFileSync,
+} from 'node:fs';
+import { tmpdir } from 'node:os';
+import { dirname, join } from 'node:path';
+import {
+  BANGDREAM_BESTDORI_MAIN_DATA_KEYS,
+  createBestdoriMainDataSyncTask,
+} from '../../../../../src/modules/qqbot/plugins/bangdream/src/application/tasks';
+import { BANGDREAM_TSUGU_ENV_KEYS } from '../../../../../src/modules/qqbot/plugins/bangdream/src/config/runtime-options';
+import { configureBangDreamRuntimeIo } from '../../../../../src/modules/qqbot/plugins/bangdream/src/infrastructure/integration/runtime-io';
+
+describe('BangDream Bestdori main-data sync task', () => {
+  let cacheRoot: string;
+  let consoleInfoSpy: jest.SpyInstance;
+
+  beforeEach(() => {
+    cacheRoot = mkdtempSync(join(tmpdir(), 'bangdream-sync-'));
+    consoleInfoSpy = jest.spyOn(console, 'info').mockImplementation();
+  });
+
+  afterEach(() => {
+    consoleInfoSpy.mockRestore();
+    rmSync(cacheRoot, { force: true, recursive: true });
+  });
+
+  it('downloads main JSON data, writes cache atomically, and returns safe summary', async () => {
+    const requestedUrls: string[] = [];
+    configureBangDreamRuntimeIo({
+      getConfig: (key) =>
+        key === BANGDREAM_TSUGU_ENV_KEYS.cacheRoot ? cacheRoot : undefined,
+      readJsonFile: async (filePath) =>
+        JSON.parse(readFileSync(filePath, 'utf8')),
+      readExcelRows: async () => [],
+      renameFile: async (from, to) => {
+        mkdirSync(dirname(to), { recursive: true });
+        renameSync(from, to);
+      },
+      requestJson: async <T = unknown>(url: string) => {
+        requestedUrls.push(`${url}`);
+        return { body: { ok: true, url } as T };
+      },
+      writeJsonFile: async (filePath, data) => {
+        mkdirSync(dirname(filePath), { recursive: true });
+        writeFileSync(filePath, `${JSON.stringify(data)}\n`);
+      },
+    });
+
+    const task = createBestdoriMainDataSyncTask();
+    const output = await task.execute({ keys: ['songs', 'meta'] });
+
+    expect(output).toMatchObject({
+      failedCount: 0,
+      successCount: 2,
+      syncedKeys: ['songs', 'meta'],
+    });
+    expect(
+      readFileSync(join(cacheRoot, 'bestdori', 'songs.json'), 'utf8'),
+    ).toContain('"ok":true');
+    expect(
+      readFileSync(join(cacheRoot, 'bestdori', 'meta.json'), 'utf8'),
+    ).toContain('"ok":true');
+    expect(requestedUrls).toHaveLength(2);
+    expect(JSON.stringify(output)).not.toContain('/api/songs/all');
+  });
+
+  it('keeps existing cache file when one key fails', async () => {
+    const metaCachePath = join(cacheRoot, 'bestdori', 'meta.json');
+    mkdirSync(dirname(metaCachePath), { recursive: true });
+    writeFileSync(metaCachePath, '{"previous":true}\n');
+    configureBangDreamRuntimeIo({
+      getConfig: (key) =>
+        key === BANGDREAM_TSUGU_ENV_KEYS.cacheRoot ? cacheRoot : undefined,
+      readJsonFile: async (filePath) =>
+        JSON.parse(readFileSync(filePath, 'utf8')),
+      readExcelRows: async () => [],
+      renameFile: async (from, to) => {
+        mkdirSync(dirname(to), { recursive: true });
+        renameSync(from, to);
+      },
+      requestJson: async <T = unknown>(url: string) => {
+        if (`${url}`.includes('/api/songs/meta/')) {
+          throw new Error('network failed');
+        }
+        return { body: { ok: true } as T };
+      },
+      writeJsonFile: async (filePath, data) => {
+        mkdirSync(dirname(filePath), { recursive: true });
+        writeFileSync(filePath, `${JSON.stringify(data)}\n`);
+      },
+    });
+
+    const task = createBestdoriMainDataSyncTask();
+    await expect(task.execute({ keys: ['songs', 'meta'] })).rejects.toThrow(
+      'BangDream Bestdori 主数据同步失败',
+    );
+
+    expect(readFileSync(metaCachePath, 'utf8')).toContain('"previous":true');
+    expect(existsSync(join(cacheRoot, 'bestdori', 'songs.json'))).toBe(true);
+    expect(BANGDREAM_BESTDORI_MAIN_DATA_KEYS).toEqual(
+      expect.arrayContaining(['songs', 'meta', 'cards', 'skills', 'events']),
+    );
+  });
+});