diff --git a/lib/__tests__/ding-workflow-delivery.test.ts b/lib/__tests__/ding-workflow-delivery.test.ts
index 1ad83ef..b3a80f9 100644
--- a/lib/__tests__/ding-workflow-delivery.test.ts
+++ b/lib/__tests__/ding-workflow-delivery.test.ts
@@ -281,4 +281,41 @@ describe('Ding workflow delivery SLA', () => {
     expect(second.queueShiftDays).toBe(2)
     expect(second.startedAt).toBe('2026-08-03T01:00:00.000Z')
   })
+
+  it('uses businessId ordering and ignores the non-queue content-owner node', () => {
+    const makeInput = (businessId: string, workflowId: string, extraOwnerTask = false) => ({
+      processCode: CONTENT_PROCESS_CODE,
+      sourceCreatedAt: '2026-08-01T00:00:00.000Z',
+      sourceFinishedAt: '2026-08-02T00:00:00.000Z',
+      formFields: formFields({ demandType: '抖音-千川素材', taskType: '布局拍摄' }),
+      tasks: [
+        task('内容主管分配任务', '2026-08-01T01:00:00.000Z', '2026-08-01T01:00:00.000Z'),
+        ...(extraOwnerTask
+          ? [task('内容部负责人', '2026-08-02T01:00:00.000Z', '2026-08-02T01:00:00.000Z')]
+          : []),
+        task('编导审核', '2026-08-02T00:00:00.000Z', '2026-08-02T00:00:00.000Z'),
+      ],
+      businessId,
+      workflowId,
+      workflowStatus: 'COMPLETED',
+    })
+
+    const assessments = assessDingWorkflowDeliveryBatch([
+      makeInput('B-002', 'a', true),
+      makeInput('B-001', 'z'),
+      makeInput('B-003', 'b'),
+      makeInput('B-004', 'c'),
+    ])
+
+    // The external queue uses businessId for equal assignment timestamps,
+    // and the unrelated 内容部负责人 task must not move the base date.
+    expect(assessments.slice(0, 3).map((assessment) => assessment.queueSequence)).toEqual([2, 1, 3])
+    expect(assessments[0].queueShiftDays).toBe(0)
+    expect(assessments[3]).toMatchObject({
+      queueDeferred: true,
+      queueSequence: 1,
+      queueShiftDays: 1,
+      startedAt: '2026-08-02T01:00:00.000Z',
+    })
+  })
 })
diff --git a/lib/ding-workflow-delivery.ts b/lib/ding-workflow-delivery.ts
index b1fcf0a..4190d20 100644
--- a/lib/ding-workflow-delivery.ts
+++ b/lib/ding-workflow-delivery.ts
@@ -52,6 +52,8 @@ type DingWorkflowDeliveryInput = {
   sourceFinishedAt: string | null
   formFields: DingWorkflowDetailFormFields
   tasks: OngoingDingWorkflowActiveTask[]
+  /** Stable DingTalk business number used by the external queue as tie-breaker. */
+  businessId?: string | null
   /** Used only by the batch queue calculation to produce a deterministic tie-breaker. */
   workflowId?: string | null
   /** Raw workflow status; processing rows occupy queue slots, rejected rows do not. */
@@ -85,6 +87,7 @@ const CONTENT_QUEUE_GROUP_TAOXI_LAYOUT = new Set([
   '淘系-逛逛+淘系主图视频',
 ])
 const CONTENT_QUEUE_GROUP_TAOXI_SECOND_EDIT = new Set(['淘系-逛逛', '淘系主图'])
+const CONTENT_QUEUE_ASSIGNMENT_NODE_NAMES = ['内容主管分配任务', '内容负责人分配任务']
 
 const ART_RULES: ArtRule[] = [
   { type: '视觉 打板', detail: '主图+sku+详情+视频', days: 15, byQuantity: true },
@@ -552,8 +555,7 @@ export function assessDingWorkflowDeliveryBatch(inputs: DingWorkflowDeliveryInpu
     if (!policy) return
     // The external dashboard schedules by the latest assignment timestamp,
     // while the unqueued assessment still starts at the first assignment.
-    const assignmentNames = ['内容主管分配任务', '内容负责人分配任务', '内容部负责人']
-    const baseStart = latestTaskTimeByField(input.tasks, assignmentNames, 'createdAt')?.timestamp
+    const baseStart = latestTaskTimeByField(input.tasks, CONTENT_QUEUE_ASSIGNMENT_NODE_NAMES, 'createdAt')?.timestamp
       ?? parseIsoTime(assessments[index].startedAt)
     if (baseStart === null) return
     const entries = queueGroups.get(policy.key) || []
@@ -561,7 +563,9 @@ export function assessDingWorkflowDeliveryBatch(inputs: DingWorkflowDeliveryInpu
       index,
       policy,
       baseStart,
-      workflowId: normalized(input.workflowId) || String(index).padStart(8, '0'),
+      workflowId: normalized(input.businessId)
+        || normalized(input.workflowId)
+        || String(index).padStart(8, '0'),
     })
     queueGroups.set(policy.key, entries)
   })
diff --git a/lib/ding-workflow-sync.ts b/lib/ding-workflow-sync.ts
index cb5178e..1b5775c 100644
--- a/lib/ding-workflow-sync.ts
+++ b/lib/ding-workflow-sync.ts
@@ -1944,6 +1944,7 @@ async function readOnTimeDeliveryInsightsWithoutAccessCheck(now = new Date()): P
       sourceFinishedAt,
       formFields: normalizeDetailFormFields(row.formFields),
       tasks: allTasks,
+      businessId: clean(row.businessId),
       workflowId: clean(row.processInstanceId),
       workflowStatus: clean(row.status),
     }