diff --git a/apps/backend/src/services/fulfillment/kuaishou-feifei/index.test.ts b/apps/backend/src/services/fulfillment/kuaishou-feifei/index.test.ts
index 759619a7..dbc65af2 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-feifei/index.test.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-feifei/index.test.ts
@@ -1,7 +1,11 @@
 import test from 'node:test'
 import assert from 'node:assert/strict'
 
-import { resolveKuaishouFeifeiClaimUrl } from './index.js'
+import {
+  buildFeifeiPlatformOrderNo,
+  resolveKuaishouFeifeiClaimUrl,
+} from './index.js'
+import type { TaskRow } from '../../../types/repository/rows.js'
 
 test('resolveKuaishouFeifeiClaimUrl prefers feifei h5 url over local claim url', () => {
   assert.equal(
@@ -41,3 +45,66 @@ test('resolveKuaishouFeifeiClaimUrl prefers internal short link', () => {
     'https://ks.khhao.com/s/AbCd1234',
   )
 })
+
+test('buildFeifeiPlatformOrderNo prefers source order number', () => {
+  assert.equal(
+    buildFeifeiPlatformOrderNo(createTask({
+      platform_order_id: 'KS202607080001',
+      task_no: 'DT600a8bd23b8',
+    })),
+    'KS202607080001',
+  )
+})
+
+test('buildFeifeiPlatformOrderNo falls back to task number', () => {
+  assert.equal(
+    buildFeifeiPlatformOrderNo(createTask({
+      platform_order_id: '',
+      task_no: 'DT600a8bd23b8',
+    })),
+    'DT600a8bd23b8',
+  )
+})
+
+function createTask(patch: Partial<TaskRow> = {}): TaskRow {
+  return {
+    id: 123,
+    order_id: 456,
+    order_item_id: 789,
+    unit_index: 0,
+    platform_order_id: '',
+    profile_id: 0,
+    task_no: '',
+    executor_key: 'kuaishou_feifei',
+    task_status: 'pending',
+    delivery_status: 'pending',
+    result_code: '',
+    result_message: '',
+    automation_mode: 'auto',
+    requires_claim: true,
+    user_action_status: 'not_required',
+    attempt_count: 0,
+    runtime_session_id: '',
+    login_type: '',
+    nickname: '',
+    role_name: '',
+    role_id: '',
+    area: '',
+    partition_name: '',
+    claim_token: '',
+    primary_claim_token: '',
+    primary_claim_token_id: null,
+    primary_claim_token_status: '',
+    artifacts_json: '{}',
+    context_json: '{}',
+    screenshot_path: '',
+    last_error: '',
+    retry_count: 0,
+    created_at: '2026-07-08T00:00:00.000Z',
+    updated_at: '2026-07-08T00:00:00.000Z',
+    claimed_at: null,
+    role_confirmed_at: null,
+    redeemed_at: null,
+    ...patch,
+  }
+}
diff --git a/apps/backend/src/services/fulfillment/kuaishou-feifei/index.ts b/apps/backend/src/services/fulfillment/kuaishou-feifei/index.ts
index 54e3f1d7..f23a781b 100644
--- a/apps/backend/src/services/fulfillment/kuaishou-feifei/index.ts
+++ b/apps/backend/src/services/fulfillment/kuaishou-feifei/index.ts
@@ -343,7 +343,12 @@ function isLocalClaimUrl(value: unknown) {
   return !/^https?:\/\//i.test(url) || url.includes('/#/claim/')
 }
 
-function buildFeifeiPlatformOrderNo(task: TaskRow) {
+export function buildFeifeiPlatformOrderNo(task: TaskRow) {
+  const platformOrderId = String(task.platform_order_id || '').trim()
+  if (platformOrderId && platformOrderId.length <= 64) {
+    return platformOrderId
+  }
+
   const taskNo = String(task.task_no || '').trim()
   if (taskNo && taskNo.length <= 64) {
     return taskNo