diff --git a/components/department-dashboard/PerformanceConversionDashboard.test.tsx b/components/department-dashboard/PerformanceConversionDashboard.test.tsx
index 993e8548..1fc1cb28 100644
--- a/components/department-dashboard/PerformanceConversionDashboard.test.tsx
+++ b/components/department-dashboard/PerformanceConversionDashboard.test.tsx
@@ -32,6 +32,7 @@ const workflowItem = {
   brand: '亿家达' as const,
   productId: '1041432226288',
   spu: 'SPU-001',
+  platform: '天猫',
   completedAt: '2026-07-12T08:00:00.000Z',
   monitorStartDate: '2026-07-12',
   monitorEndDate: '2027-01-12',
@@ -134,6 +135,22 @@ describe('PerformanceConversionDashboard filters', () => {
     expect(detailUrl.searchParams.get('completedFrom')).toBe('2026-07-01')
     expect(detailUrl.searchParams.get('completedTo')).toBe('2026-07-31')
     expect(detailUrl.searchParams.get('page')).toBe('3')
+    expect(screen.getAllByText('平台 天猫')).toHaveLength(2)
+    expect(screen.queryByText(`实例 ${workflowItem.workflowId}`)).not.toBeInTheDocument()
     expect(fetchMock).not.toHaveBeenCalledWith(expect.stringContaining('/timeseries'), expect.anything())
   })
+
+  it('shows an explicit placeholder when the workflow platform is missing', async () => {
+    global.fetch = jest.fn().mockResolvedValue({
+      ok: true,
+      json: async () => ({
+        success: true,
+        data: { ...emptyList, items: [{ ...workflowItem, platform: null }], total: 1 },
+      }),
+    } as Response)
+
+    render(<PerformanceConversionDashboard />)
+
+    expect(await screen.findAllByText('平台 —')).toHaveLength(2)
+  })
 })
diff --git a/components/department-dashboard/PerformanceConversionDashboard.tsx b/components/department-dashboard/PerformanceConversionDashboard.tsx
index 3b8c2f6d..62757c21 100644
--- a/components/department-dashboard/PerformanceConversionDashboard.tsx
+++ b/components/department-dashboard/PerformanceConversionDashboard.tsx
@@ -93,12 +93,12 @@ function WorkflowTable({ items, detailHref }: {
           <caption className="sr-only">2026 年 4 月 1 日以后已完结美术流程关联的商品 ID</caption>
           <thead className="bg-slate-50 text-xs font-bold text-slate-500"><tr><th className="w-[18%] px-5 py-3">商品 ID</th><th className="w-[24%] px-4 py-3">审批编号</th><th className="w-[18%] px-4 py-3">完结时间</th><th className="w-[25%] px-4 py-3">监控区间</th><th className="w-[15%] px-4 py-3">状态</th></tr></thead>
           <tbody className="divide-y divide-slate-200">
-            {items.map((item) => <tr key={item.key} className="bg-white hover:bg-slate-50"><td className="px-5 py-3"><Link href={detailHref(item)} className="break-all font-mono text-sm font-bold text-[#0050cb] underline-offset-4 hover:underline focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#1677ff]">{item.productId}</Link>{item.spu && <p className="mt-1 truncate text-xs text-slate-500">SPU {item.spu}</p>}</td><td className="px-4 py-3"><p className="break-all font-mono text-xs text-slate-700">{item.approvalNumber || '—'}</p><p className="mt-1 truncate text-xs text-slate-500" title={item.workflowId}>实例 {item.workflowId}</p></td><td className="px-4 py-3 tabular-nums text-slate-700">{formatDate(item.completedAt, true)}</td><td className="px-4 py-3 tabular-nums text-slate-700">{item.monitorStartDate} 至 {item.monitorEndDate}</td><td className="px-4 py-3"><span className={`inline-flex min-h-7 items-center rounded-md px-2 text-xs font-bold ${item.monitoringStatus === 'monitoring' ? 'bg-amber-50 text-amber-800 ring-1 ring-inset ring-amber-200' : 'bg-emerald-50 text-emerald-800 ring-1 ring-inset ring-emerald-200'}`}>{item.monitoringStatus === 'monitoring' ? '监控中' : '已满 6 个月'}</span></td></tr>)}
+            {items.map((item) => <tr key={item.key} className="bg-white hover:bg-slate-50"><td className="px-5 py-3"><Link href={detailHref(item)} className="break-all font-mono text-sm font-bold text-[#0050cb] underline-offset-4 hover:underline focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#1677ff]">{item.productId}</Link><p className="mt-1 flex flex-wrap gap-x-2 text-xs text-slate-500">{item.spu && <span className="min-w-0 max-w-full break-all">SPU {item.spu}</span>}<span className="min-w-0 max-w-full break-all">平台 {item.platform || '—'}</span></p></td><td className="px-4 py-3"><p className="break-all font-mono text-xs text-slate-700">{item.approvalNumber || '—'}</p></td><td className="px-4 py-3 tabular-nums text-slate-700">{formatDate(item.completedAt, true)}</td><td className="px-4 py-3 tabular-nums text-slate-700">{item.monitorStartDate} 至 {item.monitorEndDate}</td><td className="px-4 py-3"><span className={`inline-flex min-h-7 items-center rounded-md px-2 text-xs font-bold ${item.monitoringStatus === 'monitoring' ? 'bg-amber-50 text-amber-800 ring-1 ring-inset ring-amber-200' : 'bg-emerald-50 text-emerald-800 ring-1 ring-inset ring-emerald-200'}`}>{item.monitoringStatus === 'monitoring' ? '监控中' : '已满 6 个月'}</span></td></tr>)}
           </tbody>
         </table>
       </div>
       <ul className="divide-y divide-slate-200 md:hidden" aria-label="美术流程商品 ID 列表">
-        {items.map((item) => <li key={item.key} className="bg-white p-4"><Link href={detailHref(item)} className="block w-full text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#1677ff]"><span className="font-mono text-sm font-bold text-[#0050cb]">{item.productId}</span><span className="mt-1 block text-xs text-slate-500">审批编号 {item.approvalNumber || '—'}</span><dl className="mt-3 grid grid-cols-2 gap-3 text-xs"><div><dt className="text-slate-500">完结时间</dt><dd className="mt-1 font-semibold text-slate-800">{formatDate(item.completedAt)}</dd></div><div><dt className="text-slate-500">状态</dt><dd className="mt-1 font-semibold text-slate-800">{item.monitoringStatus === 'monitoring' ? '监控中' : '已满 6 个月'}</dd></div><div className="col-span-2"><dt className="text-slate-500">监控区间</dt><dd className="mt-1 font-semibold text-slate-800">{item.monitorStartDate} 至 {item.monitorEndDate}</dd></div></dl></Link></li>)}
+        {items.map((item) => <li key={item.key} className="bg-white p-4"><Link href={detailHref(item)} className="block w-full text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-[#1677ff]"><span className="font-mono text-sm font-bold text-[#0050cb]">{item.productId}</span><span className="mt-1 flex flex-wrap gap-x-2 text-xs text-slate-500">{item.spu && <span className="min-w-0 max-w-full break-all">SPU {item.spu}</span>}<span className="min-w-0 max-w-full break-all">平台 {item.platform || '—'}</span></span><span className="mt-1 block break-all text-xs text-slate-500">审批编号 {item.approvalNumber || '—'}</span><dl className="mt-3 grid grid-cols-2 gap-3 text-xs"><div><dt className="text-slate-500">完结时间</dt><dd className="mt-1 font-semibold text-slate-800">{formatDate(item.completedAt)}</dd></div><div><dt className="text-slate-500">状态</dt><dd className="mt-1 font-semibold text-slate-800">{item.monitoringStatus === 'monitoring' ? '监控中' : '已满 6 个月'}</dd></div><div className="col-span-2"><dt className="text-slate-500">监控区间</dt><dd className="mt-1 font-semibold text-slate-800">{item.monitorStartDate} 至 {item.monitorEndDate}</dd></div></dl></Link></li>)}
       </ul>
     </>
   )
diff --git a/components/department-dashboard/PerformanceConversionDetail.test.tsx b/components/department-dashboard/PerformanceConversionDetail.test.tsx
index 1d9a4177..2db46293 100644
--- a/components/department-dashboard/PerformanceConversionDetail.test.tsx
+++ b/components/department-dashboard/PerformanceConversionDetail.test.tsx
@@ -17,6 +17,7 @@ const detailData = {
     brand: '亿家达' as const,
     productId: '1041432226288',
     spu: 'SPU-001',
+    platform: '天猫',
     completedAt: '2026-07-12T08:00:00.000Z',
     monitorStartDate: '2026-07-12',
     monitorEndDate: '2027-01-12',
diff --git a/components/department-dashboard/performance-conversion.ts b/components/department-dashboard/performance-conversion.ts
index d2adcb24..937712f4 100644
--- a/components/department-dashboard/performance-conversion.ts
+++ b/components/department-dashboard/performance-conversion.ts
@@ -30,6 +30,7 @@ export type PerformanceConversionWorkflowItem = {
   brand: PerformanceConversionBrand
   productId: string
   spu: string | null
+  platform: string | null
   completedAt: string
   monitorStartDate: string
   monitorEndDate: string
diff --git a/lib/__tests__/performance-conversion-workflow-filter.test.ts b/lib/__tests__/performance-conversion-workflow-filter.test.ts
index a6a37c52..276194bf 100644
--- a/lib/__tests__/performance-conversion-workflow-filter.test.ts
+++ b/lib/__tests__/performance-conversion-workflow-filter.test.ts
@@ -34,6 +34,7 @@ function snapshot(
   brand: string,
   sourceFinishedAtRaw: string,
   productId: string | null,
+  platform: string | null = '天猫',
 ) {
   return {
     processInstanceId,
@@ -45,7 +46,7 @@ function snapshot(
     processCode: 'art-process',
     brand,
     sourceFinishedAtRaw,
-    formFields: productId ? { productId } : {},
+    formFields: productId ? { productId, platform } : {},
     syncedAt: new Date('2026-09-17T00:00:00.000Z'),
   }
 }
@@ -71,6 +72,7 @@ describe('performance conversion completion date filters', () => {
     })
 
     expect(result.items.map((item) => item.productId)).toEqual(['222222', '333333'])
+    expect(result.items.map((item) => item.platform)).toEqual(['天猫', '天猫'])
     expect(result.total).toBe(2)
     expect(result.invalidProductIdCount).toBe(1)
     expect(result.brands.find((item) => item.brand === '亿家达')?.count).toBe(2)
@@ -82,6 +84,21 @@ describe('performance conversion completion date filters', () => {
     })
   })
 
+  it('returns the workflow platform for every product id and keeps missing values explicit', async () => {
+    findMany.mockResolvedValue([
+      snapshot('multiple-ids', '亿家达', '2026-07-12T08:00:00.000Z', '111111, 222222', '京东'),
+      snapshot('missing-platform', '亿家达', '2026-07-11T08:00:00.000Z', '333333', null),
+    ])
+
+    const result = await getPerformanceConversionWorkflows(null, { brand: '亿家达' })
+
+    expect(result.items.map(({ productId, platform }) => ({ productId, platform }))).toEqual([
+      { productId: '111111', platform: '京东' },
+      { productId: '222222', platform: '京东' },
+      { productId: '333333', platform: null },
+    ])
+  })
+
   it('rejects invalid or reversed date ranges before reading snapshots', async () => {
     await expect(getPerformanceConversionWorkflows(null, {
       completedFrom: '2026-02-29',
diff --git a/lib/performance-conversion.ts b/lib/performance-conversion.ts
index fe186578..83519acc 100644
--- a/lib/performance-conversion.ts
+++ b/lib/performance-conversion.ts
@@ -107,6 +107,7 @@ function workflowItems(row: SnapshotRow): PerformanceConversionWorkflowItem[] {
     brand: brand as PerformanceConversionBrand,
     productId,
     spu: clean(fields.spu),
+    platform: clean(fields.platform),
     completedAt,
     monitorStartDate,
     monitorEndDate,