diff --git a/apps/backend/src/services/session/session-page.ts b/apps/backend/src/services/session/session-page.ts
index 4abcd16b..bc423f5b 100644
--- a/apps/backend/src/services/session/session-page.ts
+++ b/apps/backend/src/services/session/session-page.ts
@@ -13,14 +13,18 @@ type LocatorLike = {
   count: () => Promise<number>
   first: () => LocatorLike
   click: (options?: { timeout?: number }) => Promise<void>
+  waitFor: (options?: { state?: string; timeout?: number }) => Promise<void>
+  screenshot: (options: { path: string }) => Promise<void>
 }
 
 type BrowserPageLike = {
+  frames: () => any[]
   locator: (selector: string) => LocatorLike
   waitForTimeout: (milliseconds: number) => Promise<void>
   evaluate: <T = any>(callback: any) => Promise<T>
   reload: (options?: { waitUntil?: string }) => Promise<unknown>
   goto: (url: string, options?: { waitUntil?: string }) => Promise<unknown>
+  context: () => any
 }
 
 type SessionForQrCapture = {
diff --git a/apps/backend/src/services/session/session-qq.js b/apps/backend/src/services/session/session-qq.ts
similarity index 71%
rename from apps/backend/src/services/session/session-qq.js
rename to apps/backend/src/services/session/session-qq.ts
index 79b4607b..bf96d042 100644
--- a/apps/backend/src/services/session/session-qq.js
+++ b/apps/backend/src/services/session/session-qq.ts
@@ -1,4 +1,4 @@
-// @ts-nocheck
+/// <reference lib="dom" />
 
 import fs from 'node:fs/promises'
 
@@ -6,9 +6,48 @@ import { downloadRemoteQrImage, logBrowserSessionDebug, waitForFrame } from './s
 
 const QQ_QR_TARGET_SIZE = 144
 
-export async function ensureQqLoginReady(page) {
+type LocatorLike = {
+  count: () => Promise<number>
+  click: (options?: { timeout?: number }) => Promise<void>
+  waitFor: (options?: { state?: string; timeout?: number }) => Promise<void>
+  screenshot: (options: { path: string }) => Promise<void>
+  first: () => LocatorLike
+}
+
+type FrameLike = {
+  url: () => string
+  locator: (selector: string) => LocatorLike
+  waitForTimeout: (milliseconds: number) => Promise<void>
+  evaluate: <T = any>(callback: any) => Promise<T>
+}
+
+type PageLike = {
+  frames: () => FrameLike[]
+  waitForTimeout: (milliseconds: number) => Promise<void>
+  locator: (selector: string) => LocatorLike
+  context: () => {
+    request: {
+      get: (url: string, options?: any) => Promise<{
+        ok: () => boolean
+        status: () => number
+        body: () => Promise<Buffer>
+      }>
+    }
+  }
+}
+
+type QqQrState = {
+  visible: boolean
+  qrVisible?: boolean
+  scanned: boolean
+  expired: boolean
+  message: string
+  frameUrl?: string
+}
+
+export async function ensureQqLoginReady(page: PageLike): Promise<void> {
   try {
-    const frame = await waitForFrame(
+    const frame = await waitForFrame<FrameLike>(
       page,
       (item) => item.url().includes('xui.ptlogin2.qq.com/cgi-bin/xlogin'),
       10_000,
@@ -26,8 +65,8 @@ export async function ensureQqLoginReady(page) {
   }
 }
 
-export async function captureQqQrImage(page, qrImagePath) {
-  const frame = await waitForFrame(
+export async function captureQqQrImage(page: PageLike, qrImagePath: string): Promise<void> {
+  const frame = await waitForFrame<FrameLike>(
     page,
     (item) => item.url().includes('xui.ptlogin2.qq.com/cgi-bin/xlogin'),
     10_000,
@@ -45,11 +84,11 @@ export async function captureQqQrImage(page, qrImagePath) {
     const body = await downloadRemoteQrImage(page, effectiveQrUrl, qrImagePath, frame.url(), 'qq')
     logBrowserSessionDebug('qq.capture.downloadResult', {
       qrUrl: effectiveQrUrl,
-      downloaded: Boolean(body?.length),
+      downloaded: Buffer.isBuffer(body) && body.length > 0,
       qrImagePath,
     })
 
-    if (body?.length) {
+    if (Buffer.isBuffer(body) && body.length > 0) {
       await fs.writeFile(qrImagePath, body)
       return
     }
@@ -71,10 +110,10 @@ export async function captureQqQrImage(page, qrImagePath) {
   }
 }
 
-export async function findQqQrLocator(page, frame = null) {
+export async function findQqQrLocator(page: PageLike, frame: FrameLike | null = null): Promise<LocatorLike> {
   const effectiveFrame =
     frame ||
-    await waitForFrame(page, (item) => item.url().includes('xui.ptlogin2.qq.com/cgi-bin/xlogin'))
+    await waitForFrame<FrameLike>(page, (item) => item.url().includes('xui.ptlogin2.qq.com/cgi-bin/xlogin'))
   const locator = effectiveFrame.locator('#qrlogin_img')
   await locator.waitFor({ state: 'visible', timeout: 15_000 })
   logBrowserSessionDebug('qq.findQrLocator.visibleReady', {
@@ -83,7 +122,7 @@ export async function findQqQrLocator(page, frame = null) {
   return locator
 }
 
-export async function extractQqQrState(page) {
+export async function extractQqQrState(page: Pick<PageLike, 'frames'>): Promise<QqQrState> {
   const frame = page.frames().find((item) => item.url().includes('xui.ptlogin2.qq.com/cgi-bin/xlogin'))
 
   if (!frame) {
@@ -98,7 +137,7 @@ export async function extractQqQrState(page) {
   try {
     const { qrVisible, bodyText } = await frame
       .evaluate(() => {
-        const isVisible = (element) => {
+        const isVisible = (element: Element | null) => {
           if (!(element instanceof HTMLElement)) {
             return false
           }
@@ -151,7 +190,7 @@ export async function extractQqQrState(page) {
   }
 }
 
-async function resolveQqQrImageUrl(frame) {
+async function resolveQqQrImageUrl(frame: FrameLike): Promise<string> {
   return frame
     .evaluate(() => {
       const qrImage = document.querySelector('#qrlogin_img')
@@ -176,7 +215,7 @@ async function resolveQqQrImageUrl(frame) {
     .catch(() => '')
 }
 
-function upgradeQqQrImageUrl(qrUrl) {
+function upgradeQqQrImageUrl(qrUrl: string): string {
   if (!qrUrl) {
     return ''
   }
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index c87690ea..1e7f0401 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -472,6 +472,14 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+98. 腾讯浏览器 QQ 登录模块迁移到 `.ts`：
+    - `src/services/session/session-qq.ts`
+99. QQ 登录 iframe、二维码 URL 提取 / 升级、远程下载 fallback、二维码 locator 与扫码状态已显式类型化
+100. Docker 内验证通过：
+    - `src/services/session/session.test.js` 共 14 个用例通过
+    - `npm run typecheck`
+    - `npm run build`
+    - `npm test` 共 139 个用例通过
 
 ## 下一步建议