diff --git a/apps/backend/src/services/session/session-browser-config.js b/apps/backend/src/services/session/session-browser-config.ts
similarity index 66%
rename from apps/backend/src/services/session/session-browser-config.js
rename to apps/backend/src/services/session/session-browser-config.ts
index 7ccbe485..d0ea749b 100644
--- a/apps/backend/src/services/session/session-browser-config.js
+++ b/apps/backend/src/services/session/session-browser-config.ts
@@ -1,8 +1,39 @@
 import process from 'node:process'
 
-export const DEFAULT_LOGIN_TYPE = 'qq'
+export type LoginType = 'qq' | 'wx'
 
-export function resolveBrowserLaunchOptions(options = {}) {
+export const DEFAULT_LOGIN_TYPE: LoginType = 'qq'
+
+type BrowserConfigInput = {
+  headless?: boolean
+  devtools?: boolean
+  keepAlive?: boolean
+  prewarm?: boolean
+  slowMoMs?: number
+}
+
+type ResolveBrowserLaunchOptionsInput = {
+  browserConfig?: BrowserConfigInput
+  chromePath?: string
+  nodeEnv?: string
+  ci?: string
+}
+
+export type BrowserLaunchOptions = {
+  headless: boolean
+  devtools: boolean
+  usesBundledChromium: boolean
+  keepAlive: boolean
+  prewarm: boolean
+  slowMoMs: number
+}
+
+export type ViewportSize = {
+  width: number
+  height: number
+}
+
+export function resolveBrowserLaunchOptions(options: ResolveBrowserLaunchOptionsInput = {}): BrowserLaunchOptions {
   const browserConfig = options.browserConfig || {}
   const chromePath = options.chromePath || ''
   const nodeEnv = options.nodeEnv ?? process.env.NODE_ENV
@@ -37,7 +68,10 @@ export function resolveBrowserLaunchOptions(options = {}) {
   }
 }
 
-export function buildChromiumLaunchOptions(launchOptions, { chromePath = '' } = {}) {
+export function buildChromiumLaunchOptions(
+  launchOptions: BrowserLaunchOptions,
+  { chromePath = '' }: { chromePath?: string } = {},
+) {
   const options = {
     headless: launchOptions.headless,
     devtools: launchOptions.devtools,
@@ -54,7 +88,7 @@ export function buildChromiumLaunchOptions(launchOptions, { chromePath = '' } =
   return options
 }
 
-export function resolveDefaultViewport(rawValue = process.env.TENCENT_BROWSER_VNC_RESOLUTION) {
+export function resolveDefaultViewport(rawValue = process.env.TENCENT_BROWSER_VNC_RESOLUTION): ViewportSize {
   const fromVncResolution = parseViewportSpec(rawValue)
   if (fromVncResolution) {
     return fromVncResolution
@@ -63,7 +97,7 @@ export function resolveDefaultViewport(rawValue = process.env.TENCENT_BROWSER_VN
   return { width: 1600, height: 900 }
 }
 
-export function parseViewportSpec(rawValue) {
+export function parseViewportSpec(rawValue: unknown): ViewportSize | null {
   const text = String(rawValue || '').trim()
 
   if (!text) {
@@ -85,7 +119,7 @@ export function parseViewportSpec(rawValue) {
   return { width, height }
 }
 
-export function normalizeLoginType(value, fallback = DEFAULT_LOGIN_TYPE) {
+export function normalizeLoginType(value: unknown, fallback: LoginType = DEFAULT_LOGIN_TYPE): LoginType {
   const normalized = String(value || fallback).trim().toLowerCase()
   if (['qq', 'qc'].includes(normalized)) {
     return 'qq'
@@ -96,6 +130,6 @@ export function normalizeLoginType(value, fallback = DEFAULT_LOGIN_TYPE) {
   return fallback
 }
 
-export function getLoginTypeLabel(loginType) {
+export function getLoginTypeLabel(loginType: LoginType | string): string {
   return loginType === 'wx' ? '微信' : 'QQ'
 }
diff --git a/apps/backend/src/services/session/session-payload.js b/apps/backend/src/services/session/session-payload.ts
similarity index 61%
rename from apps/backend/src/services/session/session-payload.js
rename to apps/backend/src/services/session/session-payload.ts
index 9df357e0..595e09ad 100644
--- a/apps/backend/src/services/session/session-payload.js
+++ b/apps/backend/src/services/session/session-payload.ts
@@ -1,14 +1,14 @@
 export function buildSessionPayload(
-  session,
+  session: TencentBrowserSessionPayloadSource,
   {
     activityUrl = '',
     includeQrImage = true,
     sessionDebugEnabled = false,
     browserDebug = null,
-  } = {},
-) {
+  }: BuildSessionPayloadOptions = {},
+): any {
   const activityInfo = session.lastState?.activityInfo || null
-  const payload = {
+  const payload: Record<string, any> = {
     sessionId: session.sessionId,
     loginType: session.loginType,
     activityUrl,
@@ -45,7 +45,65 @@ export function buildSessionPayload(
   }
 }
 
-export function buildReviewPayload(review, { includeInternalPaths = false } = {}) {
+type BuildSessionPayloadOptions = {
+  activityUrl?: string
+  includeQrImage?: boolean
+  sessionDebugEnabled?: boolean
+  browserDebug?: unknown
+}
+
+type InternalPathOptions = {
+  includeInternalPaths?: boolean
+}
+
+type TencentBrowserSessionPayloadSource = {
+  sessionId: string
+  loginType?: string
+  status?: string
+  notice?: string
+  createdAt?: string
+  updatedAt?: string
+  expiresAt: string | number | Date
+  qrUpdatedAt?: string
+  qrImageBase64?: string
+  qrImagePath?: string
+  sessionDir?: string
+  lastState?: {
+    credentialReady?: boolean
+    cookieKeys?: string[]
+    activityInfo?: any
+    [key: string]: unknown
+  } | null
+  lastReview?: ReviewPayloadSource | null
+  lastRedeem?: RedeemPayloadSource | null
+}
+
+type ReviewPayloadSource = {
+  capturedAt?: string
+  roleId?: string
+  roleName?: string
+  screenshotPath?: string
+  signature?: string
+}
+
+type RedeemAttemptPayloadSource = {
+  attempt?: number
+  redeem?: unknown
+}
+
+type RedeemPayloadSource = {
+  code?: string
+  area?: string
+  proofMode?: string
+  attempts?: RedeemAttemptPayloadSource[]
+  final?: RedeemAttemptPayloadSource | null
+  finishedAt?: string
+  screenshotPath?: string
+  htmlPath?: string
+  resultPath?: string
+}
+
+export function buildReviewPayload(review: ReviewPayloadSource | null | undefined, { includeInternalPaths = false }: InternalPathOptions = {}) {
   if (!review) {
     return null
   }
@@ -67,7 +125,7 @@ export function buildReviewPayload(review, { includeInternalPaths = false } = {}
   }
 }
 
-export function buildRedeemPayload(redeem, { includeInternalPaths = false } = {}) {
+export function buildRedeemPayload(redeem: RedeemPayloadSource | null | undefined, { includeInternalPaths = false }: InternalPathOptions = {}) {
   if (!redeem) {
     return null
   }
@@ -103,7 +161,13 @@ export function buildRedeemPayload(redeem, { includeInternalPaths = false } = {}
   }
 }
 
-export function buildArtifactsPayload(session, { includeInternalPaths = false } = {}) {
+export function buildArtifactsPayload(
+  session: Pick<
+    TencentBrowserSessionPayloadSource,
+    'sessionDir' | 'qrImagePath' | 'qrImageBase64' | 'lastReview' | 'lastRedeem'
+  >,
+  { includeInternalPaths = false }: InternalPathOptions = {},
+) {
   const payload = {
     hasQrImage: Boolean(session.qrImageBase64),
     hasReviewScreenshot: Boolean(session.lastReview?.screenshotPath),
diff --git a/apps/backend/src/services/session/session-state.js b/apps/backend/src/services/session/session-state.ts
similarity index 59%
rename from apps/backend/src/services/session/session-state.js
rename to apps/backend/src/services/session/session-state.ts
index dcdcc393..9fa29631 100644
--- a/apps/backend/src/services/session/session-state.js
+++ b/apps/backend/src/services/session/session-state.ts
@@ -1,15 +1,57 @@
-import { getLoginTypeLabel } from './session-browser-config.js'
+import { getLoginTypeLabel, type LoginType } from './session-browser-config.js'
 
 export const SESSION_TTL_MS = 30 * 60 * 1000
 
+type InitialQrSessionStateOptions = {
+  updatedAt?: string
+  nowMs?: number
+  sessionTtlMs?: number
+  loginTypeLabel?: string
+}
+
+type HostState = {
+  loginText?: string
+  unloginVisible?: boolean
+  loginedVisible?: boolean
+}
+
+type QrState = {
+  expired?: boolean
+  scanned?: boolean
+}
+
+type ActivityInfo = {
+  role?: {
+    ready?: boolean
+    roleName?: string
+  }
+}
+
+type SessionStatusInput = {
+  hostState: HostState
+  qrState: QrState
+  credentialReady?: boolean
+  activityInfo?: ActivityInfo | null
+}
+
+type SessionNoticeInput = SessionStatusInput & {
+  loginType: LoginType | string
+}
+
+type CookieMap = {
+  openid?: string
+  access_token?: string
+  appid?: string
+}
+
 export function resolveInitialQrSessionState(
-  loginType,
+  loginType: LoginType | string,
   {
     updatedAt = new Date().toISOString(),
     nowMs = Date.now(),
     sessionTtlMs = SESSION_TTL_MS,
     loginTypeLabel = getLoginTypeLabel(loginType),
-  } = {},
+  }: InitialQrSessionStateOptions = {},
 ) {
   return {
     status: 'waiting_scan',
@@ -19,7 +61,11 @@ export function resolveInitialQrSessionState(
   }
 }
 
-export function resolveTencentSessionExpiresAt(session, nowMs = Date.now(), sessionTtlMs = SESSION_TTL_MS) {
+export function resolveTencentSessionExpiresAt(
+  session: { autoCloseAt?: number | string } | null | undefined,
+  nowMs = Date.now(),
+  sessionTtlMs = SESSION_TTL_MS,
+): number {
   const autoCloseAt = Number(session?.autoCloseAt || 0)
   if (autoCloseAt > 0) {
     return autoCloseAt
@@ -28,13 +74,13 @@ export function resolveTencentSessionExpiresAt(session, nowMs = Date.now(), sess
   return nowMs + sessionTtlMs
 }
 
-export function shouldRefreshLoggedInPresentation(hostState) {
+export function shouldRefreshLoggedInPresentation(hostState: HostState): boolean {
   const loginText = String(hostState?.loginText || '').trim()
 
   return Boolean(hostState?.unloginVisible || !hostState?.loginedVisible || !loginText)
 }
 
-export function resolveSessionStatus({ hostState, qrState, credentialReady, activityInfo }) {
+export function resolveSessionStatus({ hostState, qrState, credentialReady, activityInfo }: SessionStatusInput): string {
   if (hostState.loginedVisible || credentialReady) {
     if (credentialReady && activityInfo?.role?.ready) {
       return 'ready_to_redeem'
@@ -60,7 +106,7 @@ export function resolveSessionNotice({
   credentialReady,
   activityInfo,
   loginType,
-}) {
+}: SessionNoticeInput): string {
   const loginTypeLabel = getLoginTypeLabel(loginType)
 
   if (credentialReady) {
@@ -86,6 +132,6 @@ export function resolveSessionNotice({
   return `请使用${loginTypeLabel}扫码登录`
 }
 
-export function hasRedeemCredential(cookieMap) {
+export function hasRedeemCredential(cookieMap: CookieMap): boolean {
   return Boolean(cookieMap.openid && cookieMap.access_token && cookieMap.appid)
 }
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index 95321827..0972ccc5 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -426,6 +426,16 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+83. 腾讯浏览器会话配置 / 状态 / payload 纯逻辑模块迁移到 `.ts`：
+    - `src/services/session/session-browser-config.ts`
+    - `src/services/session/session-state.ts`
+    - `src/services/session/session-payload.ts`
+84. 登录类型、浏览器启动参数、默认视口、会话状态 / notice、二维码 TTL、redeem/review/artifact payload 已显式类型化；`buildSessionPayload` 对外暂保留动态返回以兼容仍未迁移的 JS 路由与 session 编排
+85. 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