diff --git a/apps/backend/src/services/admin/admin-audit-service.js b/apps/backend/src/services/admin/admin-audit-service.ts
similarity index 88%
rename from apps/backend/src/services/admin/admin-audit-service.js
rename to apps/backend/src/services/admin/admin-audit-service.ts
index 3ed2a660..4010838c 100644
--- a/apps/backend/src/services/admin/admin-audit-service.js
+++ b/apps/backend/src/services/admin/admin-audit-service.ts
@@ -2,7 +2,9 @@ import { createAdminAuditLog, listAdminAuditLogs } from '../../repositories/admi
 import { nowIso } from '../../utils/time.js'
 import { normalizeDateQuery, normalizePage, normalizePageSize, safeParseJson } from './admin-query-utils.js'
 
-export async function writeAdminAuditLog(session, payload = {}) {
+type JsonObject = Record<string, any>
+
+export async function writeAdminAuditLog(session: JsonObject | null | undefined, payload: JsonObject = {}) {
   if (!session?.userId) {
     return null
   }
@@ -19,7 +21,7 @@ export async function writeAdminAuditLog(session, payload = {}) {
   })
 }
 
-export async function getAdminAuditLogs(query = {}) {
+export async function getAdminAuditLogs(query: JsonObject = {}) {
   const page = normalizePage(query.page)
   const pageSize = normalizePageSize(query.pageSize)
   const { items, total } = await listAdminAuditLogs({
diff --git a/apps/backend/src/services/admin/admin-dashboard-service.js b/apps/backend/src/services/admin/admin-dashboard-service.ts
similarity index 95%
rename from apps/backend/src/services/admin/admin-dashboard-service.js
rename to apps/backend/src/services/admin/admin-dashboard-service.ts
index 34037b04..79dc6dc4 100644
--- a/apps/backend/src/services/admin/admin-dashboard-service.js
+++ b/apps/backend/src/services/admin/admin-dashboard-service.ts
@@ -1,8 +1,8 @@
-// @ts-check
-
 import { query } from '../../db/client.js'
 import { nowIso } from '../../utils/time.js'
 
+type JsonObject = Record<string, any>
+
 export async function getAdminDashboardSummary() {
   const todayPrefix = nowIso().slice(0, 10)
   const result = await query(
@@ -39,7 +39,7 @@ export async function getAdminDashboardSummary() {
     `,
     [todayPrefix],
   )
-  const summary = result.rows[0] || {}
+  const summary: JsonObject = result.rows[0] || {}
 
   return {
     todayOrders: Number(summary?.today_orders || 0),
diff --git a/apps/backend/src/services/admin/admin-message-delivery-service.js b/apps/backend/src/services/admin/admin-message-delivery-service.ts
similarity index 84%
rename from apps/backend/src/services/admin/admin-message-delivery-service.js
rename to apps/backend/src/services/admin/admin-message-delivery-service.ts
index eccdca2a..09013950 100644
--- a/apps/backend/src/services/admin/admin-message-delivery-service.js
+++ b/apps/backend/src/services/admin/admin-message-delivery-service.ts
@@ -1,12 +1,11 @@
-// @ts-check
-
 import { listMessageDeliveries } from '../../repositories/message-delivery-repo.js'
 import { normalizeDateQuery, normalizePage, normalizePageSize, safeParseJson } from './admin-query-utils.js'
 
-/** @typedef {import('../../types/admin-read-inputs.js').AdminMessageDeliveryListQueryInput} AdminMessageDeliveryListQueryInput */
+import type { AdminMessageDeliveryListQueryInput } from '../../types/admin-read-inputs.js'
 
-/** @param {AdminMessageDeliveryListQueryInput} [query] */
-export async function getAdminMessageDeliveries(query = /** @type {AdminMessageDeliveryListQueryInput} */ ({})) {
+type JsonObject = Record<string, any>
+
+export async function getAdminMessageDeliveries(query: AdminMessageDeliveryListQueryInput = {}) {
   const page = normalizePage(query.page)
   const pageSize = normalizePageSize(query.pageSize)
   const { items, total } = await listMessageDeliveries({
@@ -28,7 +27,7 @@ export async function getAdminMessageDeliveries(query = /** @type {AdminMessageD
   }
 }
 
-function mapAdminMessageDeliveryListItem(item) {
+function mapAdminMessageDeliveryListItem(item: JsonObject) {
   return {
     deliveryId: Number(item.id),
     provider: String(item.provider || '').trim(),
diff --git a/apps/backend/src/services/admin/admin-query-utils.js b/apps/backend/src/services/admin/admin-query-utils.ts
similarity index 70%
rename from apps/backend/src/services/admin/admin-query-utils.js
rename to apps/backend/src/services/admin/admin-query-utils.ts
index a67a47d6..967f515b 100644
--- a/apps/backend/src/services/admin/admin-query-utils.js
+++ b/apps/backend/src/services/admin/admin-query-utils.ts
@@ -1,9 +1,11 @@
-export function normalizePage(rawValue) {
+type JsonObject = Record<string, any>
+
+export function normalizePage(rawValue: unknown) {
   const parsed = Number(rawValue)
   return Number.isFinite(parsed) && parsed > 0 ? Math.floor(parsed) : 1
 }
 
-export function normalizePageSize(rawValue) {
+export function normalizePageSize(rawValue: unknown) {
   const parsed = Number(rawValue)
   if (!Number.isFinite(parsed) || parsed <= 0) {
     return 20
@@ -11,7 +13,7 @@ export function normalizePageSize(rawValue) {
   return Math.min(100, Math.floor(parsed))
 }
 
-export function normalizeDateQuery(rawValue, endOfDay = false) {
+export function normalizeDateQuery(rawValue: unknown, endOfDay = false) {
   const normalized = String(rawValue || '').trim()
 
   if (!normalized) {
@@ -25,7 +27,7 @@ export function normalizeDateQuery(rawValue, endOfDay = false) {
   return normalized
 }
 
-export function safeParseJson(rawText) {
+export function safeParseJson(rawText: unknown): JsonObject {
   if (rawText && typeof rawText === 'object') {
     return rawText
   }
diff --git a/apps/backend/src/services/admin/admin-write-service.js b/apps/backend/src/services/admin/admin-write-service.ts
similarity index 100%
rename from apps/backend/src/services/admin/admin-write-service.js
rename to apps/backend/src/services/admin/admin-write-service.ts
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index c6d14b45..e41b4c23 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -703,6 +703,18 @@
     - `npm run typecheck`
     - `npm run build`
     - `npm test` 共 139 个用例通过
+174. 后台 Admin 查询 / 审计 / 仪表盘 / 消息投递 / 写入口迁移到 `.ts`：
+    - `src/services/admin/admin-query-utils.ts`
+    - `src/services/admin/admin-audit-service.ts`
+    - `src/services/admin/admin-dashboard-service.ts`
+    - `src/services/admin/admin-message-delivery-service.ts`
+    - `src/services/admin/admin-write-service.ts`
+175. Admin 分页与日期查询归一化、审计日志写入 / 查询、仪表盘汇总、消息投递列表、后台写操作聚合入口已进入 TS 编译链路；query、session、payload、映射 row 补齐动态对象类型
+176. Docker 内验证通过：
+    - `src/services/admin/*.test.js` 共 8 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