diff --git a/apps/backend/src/repositories/order-repo.js b/apps/backend/src/repositories/order-repo.ts
similarity index 65%
rename from apps/backend/src/repositories/order-repo.js
rename to apps/backend/src/repositories/order-repo.ts
index de8b2d31..66d8944e 100644
--- a/apps/backend/src/repositories/order-repo.js
+++ b/apps/backend/src/repositories/order-repo.ts
@@ -1,17 +1,36 @@
-// @ts-check
-
 import { query } from '../db/client.js'
+import type {
+  OrderCreateInput,
+  OrderListQueryInput,
+  OrderUpdateInput,
+} from '../types/repository-inputs.js'
+import type {
+  OrderListQueryResult,
+  OrderListRow,
+  OrderRow,
+} from '../types/repository-rows.js'
 
-/** @typedef {import('../types/repository-inputs.js').OrderCreateInput} OrderCreateInput */
-/** @typedef {import('../types/repository-inputs.js').OrderListQueryInput} OrderListQueryInput */
-/** @typedef {import('../types/repository-inputs.js').OrderUpdateInput} OrderUpdateInput */
-/** @typedef {import('../types/repository-rows.js').OrderListQueryResult} OrderListQueryResult */
-/** @typedef {import('../types/repository-rows.js').OrderListRow} OrderListRow */
-/** @typedef {import('../types/repository-rows.js').OrderRow} OrderRow */
+type OrderPlatformLookupInput = {
+  provider?: string
+  platform: string
+  shopId?: string
+  platformOrderId: string
+}
 
-/** @returns {Promise<OrderRow | null>} */
-export async function findOrderByPlatformOrderId({ provider = 'agiso', platform, shopId = '', platformOrderId }) {
-  const result = await query(
+type OrderPlatformCandidateLookupInput = {
+  provider?: string
+  platform?: string
+  shopIds?: unknown[]
+  platformOrderId?: string
+}
+
+export async function findOrderByPlatformOrderId({
+  provider = 'agiso',
+  platform,
+  shopId = '',
+  platformOrderId,
+}: OrderPlatformLookupInput): Promise<OrderRow | null> {
+  const result = await query<OrderRow>(
     `
       SELECT *
       FROM orders
@@ -21,16 +40,15 @@ export async function findOrderByPlatformOrderId({ provider = 'agiso', platform,
     [provider, platform, shopId, platformOrderId],
   )
 
-  return /** @type {OrderRow | null} */ (result.rows[0] || null)
+  return result.rows[0] || null
 }
 
-/** @returns {Promise<OrderRow | null>} */
 export async function findOrderByPlatformOrderIdCandidates({
   provider = 'agiso',
   platform,
   shopIds = [],
   platformOrderId,
-}) {
+}: OrderPlatformCandidateLookupInput): Promise<OrderRow | null> {
   const normalizedShopIds = [...new Set((Array.isArray(shopIds) ? shopIds : [])
     .map((item) => String(item || '').trim())
     .filter(Boolean))]
@@ -39,7 +57,7 @@ export async function findOrderByPlatformOrderIdCandidates({
     return null
   }
 
-  const result = await query(
+  const result = await query<OrderRow>(
     `
       SELECT *
       FROM orders
@@ -50,13 +68,11 @@ export async function findOrderByPlatformOrderIdCandidates({
     [provider, platform, normalizedShopIds, platformOrderId],
   )
 
-  return /** @type {OrderRow | null} */ (result.rows[0] || null)
+  return result.rows[0] || null
 }
 
-/** @returns {Promise<OrderRow | null>} */
-/** @param {OrderCreateInput} input */
-export async function createOrder(input) {
-  const result = await query(
+export async function createOrder(input: OrderCreateInput): Promise<OrderRow | null> {
+  const result = await query<OrderRow>(
     `
       INSERT INTO orders (
         provider,
@@ -98,13 +114,11 @@ export async function createOrder(input) {
     ],
   )
 
-  return /** @type {OrderRow | null} */ (result.rows[0] || null)
+  return result.rows[0] || null
 }
 
-/** @returns {Promise<OrderRow | null>} */
-/** @param {OrderUpdateInput} input */
-export async function updateOrder(orderId, input) {
-  const result = await query(
+export async function updateOrder(orderId: number | string, input: OrderUpdateInput): Promise<OrderRow | null> {
+  const result = await query<OrderRow>(
     `
       UPDATE orders
       SET
@@ -144,17 +158,14 @@ export async function updateOrder(orderId, input) {
     ],
   )
 
-  return /** @type {OrderRow | null} */ (result.rows[0] || null)
+  return result.rows[0] || null
 }
 
-/** @returns {Promise<OrderRow | null>} */
-export async function getOrderById(orderId) {
-  const result = await query('SELECT * FROM orders WHERE id = $1 LIMIT 1', [Number(orderId)])
-  return /** @type {OrderRow | null} */ (result.rows[0] || null)
+export async function getOrderById(orderId: number | string): Promise<OrderRow | null> {
+  const result = await query<OrderRow>('SELECT * FROM orders WHERE id = $1 LIMIT 1', [Number(orderId)])
+  return result.rows[0] || null
 }
 
-/** @returns {Promise<OrderListQueryResult>} */
-/** @param {OrderListQueryInput} [queryInput] */
 export async function listOrders({
   page = 1,
   pageSize = 20,
@@ -163,10 +174,10 @@ export async function listOrders({
   skuCode = '',
   dateFrom = '',
   dateTo = '',
-} = /** @type {OrderListQueryInput} */ ({})) {
+}: OrderListQueryInput = {}): Promise<OrderListQueryResult> {
   const offset = (page - 1) * pageSize
-  const filters = []
-  const params = []
+  const filters: string[] = []
+  const params: unknown[] = []
 
   if (platformOrderId) {
     params.push(`%${platformOrderId}%`)
@@ -194,11 +205,14 @@ export async function listOrders({
   }
 
   const whereClause = filters.length > 0 ? `WHERE ${filters.join(' AND ')}` : ''
-  const totalResult = await query(`SELECT COUNT(*)::int AS total FROM orders o ${whereClause}`, params)
+  const totalResult = await query<{ [column: string]: unknown, total: number }>(
+    `SELECT COUNT(*)::int AS total FROM orders o ${whereClause}`,
+    params,
+  )
 
   params.push(pageSize)
   params.push(offset)
-  const itemsResult = await query(
+  const itemsResult = await query<OrderListRow>(
     `
       SELECT
         o.*,
@@ -212,7 +226,7 @@ export async function listOrders({
   )
 
   return {
-    items: /** @type {OrderListRow[]} */ (itemsResult.rows),
+    items: itemsResult.rows,
     total: Number(totalResult.rows[0]?.total || 0),
   }
 }
diff --git a/apps/backend/src/repositories/task-inventory-binding-repo.js b/apps/backend/src/repositories/task-inventory-binding-repo.ts
similarity index 72%
rename from apps/backend/src/repositories/task-inventory-binding-repo.js
rename to apps/backend/src/repositories/task-inventory-binding-repo.ts
index 4089b510..497f3710 100644
--- a/apps/backend/src/repositories/task-inventory-binding-repo.js
+++ b/apps/backend/src/repositories/task-inventory-binding-repo.ts
@@ -1,13 +1,13 @@
-// @ts-check
-
 import { query } from '../db/client.js'
+import type {
+  TaskInventoryBindingRow,
+  TaskInventoryBindingSummaryRow,
+} from '../types/repository-rows.js'
 
-/** @typedef {import('../types/repository-rows.js').TaskInventoryBindingRow} TaskInventoryBindingRow */
-/** @typedef {import('../types/repository-rows.js').TaskInventoryBindingSummaryRow} TaskInventoryBindingSummaryRow */
-
-/** @returns {Promise<TaskInventoryBindingRow[]>} */
-export async function listTaskInventoryBindingsByTaskId(taskId) {
-  const result = await query(
+export async function listTaskInventoryBindingsByTaskId(
+  taskId: number | string,
+): Promise<TaskInventoryBindingRow[]> {
+  const result = await query<TaskInventoryBindingRow>(
     `
       SELECT
         tib.id,
@@ -36,12 +36,13 @@ export async function listTaskInventoryBindingsByTaskId(taskId) {
     [Number(taskId)],
   )
 
-  return /** @type {TaskInventoryBindingRow[]} */ (result.rows)
+  return result.rows
 }
 
-/** @returns {Promise<TaskInventoryBindingRow | null>} */
-export async function getTaskInventoryBindingById(bindingId) {
-  const result = await query(
+export async function getTaskInventoryBindingById(
+  bindingId: number | string,
+): Promise<TaskInventoryBindingRow | null> {
+  const result = await query<TaskInventoryBindingRow>(
     `
       SELECT
         tib.id,
@@ -70,11 +71,12 @@ export async function getTaskInventoryBindingById(bindingId) {
     [Number(bindingId)],
   )
 
-  return /** @type {TaskInventoryBindingRow | null} */ (result.rows[0] || null)
+  return result.rows[0] || null
 }
 
-/** @returns {Promise<TaskInventoryBindingSummaryRow[]>} */
-export async function listTaskInventoryBindingSummariesByTaskIds(taskIds = []) {
+export async function listTaskInventoryBindingSummariesByTaskIds(
+  taskIds: unknown[] = [],
+): Promise<TaskInventoryBindingSummaryRow[]> {
   const normalizedTaskIds = Array.from(new Set((Array.isArray(taskIds) ? taskIds : [])
     .map((value) => Number(value))
     .filter((value) => Number.isFinite(value) && value > 0)))
@@ -83,7 +85,7 @@ export async function listTaskInventoryBindingSummariesByTaskIds(taskIds = []) {
     return []
   }
 
-  const result = await query(
+  const result = await query<TaskInventoryBindingSummaryRow>(
     `
       SELECT
         tib.task_id,
@@ -99,5 +101,5 @@ export async function listTaskInventoryBindingSummariesByTaskIds(taskIds = []) {
     [normalizedTaskIds],
   )
 
-  return /** @type {TaskInventoryBindingSummaryRow[]} */ (result.rows)
+  return result.rows
 }
diff --git a/docs/backend-typescript-migration-plan.md b/docs/backend-typescript-migration-plan.md
index 66769d89..7657fd55 100644
--- a/docs/backend-typescript-migration-plan.md
+++ b/docs/backend-typescript-migration-plan.md
@@ -228,12 +228,15 @@
     - `src/repositories/admin-user-repo.ts`
     - `src/repositories/product-match-rule-repo.ts`
     - `src/repositories/fulfillment-profile-repo.ts`
+15. repository 第四批已迁移到 `.ts`：
+    - `src/repositories/order-repo.ts`
+    - `src/repositories/task-inventory-binding-repo.ts`
 
 ## 下一步建议
 
 第一批继续推进时，建议按这个顺序：
 
-1. 继续迁移剩余核心 repository：`inventory-repo`、`order-repo`、`task-repo`
+1. 继续迁移剩余核心 repository：`inventory-repo`、`task-repo`
 2. 拆分并迁移 `runtime.js`，把 env 解析、默认配置加载、配置合并分开
 3. 为 webhook、库存换码、自动发货补测试