diff --git a/furniture-3d-system/src/server/services/__tests__/asset-center.service.test.ts b/furniture-3d-system/src/server/services/__tests__/asset-center.service.test.ts
index 7a6cfcf8..961d633e 100644
--- a/furniture-3d-system/src/server/services/__tests__/asset-center.service.test.ts
+++ b/furniture-3d-system/src/server/services/__tests__/asset-center.service.test.ts
@@ -49,6 +49,7 @@ jest.mock('../../repositories', () => ({
   },
   intakeNonIntegratedProductRepository: {
     listActive: jest.fn(),
+    findBySpu: jest.fn(),
     updatePayloadByUser: jest.fn(),
     updateAttachmentPayloadByUser: jest.fn(),
   },
@@ -173,6 +174,7 @@ describe('assetCenterService', () => {
     mockedAssetVariantRepository.findActiveBySeriesCode.mockResolvedValue([] as never)
     mockedAssetVariantRepository.releaseDeletedUniqueKeys.mockResolvedValue(undefined as never)
     mockedIntakeNonIntegratedProductRepository.listActive.mockResolvedValue([] as never)
+    mockedIntakeNonIntegratedProductRepository.findBySpu.mockResolvedValue(null as never)
     mockedIntakeNonIntegratedProductRepository.updatePayloadByUser.mockResolvedValue({} as never)
     mockedIntakeNonIntegratedProductRepository.updateAttachmentPayloadByUser.mockResolvedValue({} as never)
     mockedSubstrateRepository.findById.mockResolvedValue({
@@ -365,6 +367,90 @@ describe('assetCenterService', () => {
     }
   })
 
+  it('preserves the persisted component detail SPU when the configured SPU is occupied by stock data', async () => {
+    const syncSpy = jest
+      .spyOn(intakeNonIntegratedProductService, 'syncSeriesComponentDetailProductForSystem')
+      .mockResolvedValue(undefined)
+    const configuredSeries = {
+      ...defaultAssetSeries,
+      metadata: {
+        componentSpu: 'DNZ0384',
+        finishedProductSpu: 'DNZ0385',
+      },
+    }
+    mockedAssetSeriesRepository.findById.mockResolvedValueOnce(configuredSeries as never)
+    mockedIntakeNonIntegratedProductRepository.listActive.mockResolvedValueOnce([
+      {
+        id: 'DBZ-SPJ-1780539433902',
+        spu: 'PJ0039',
+        brand: '其他品牌-普通大货',
+        updatedBy: 'user-1',
+        payload: {
+          id: 'DBZ-SPJ-1780539433902',
+          spu: 'PJ0039',
+          productCode: 'PJ0039',
+          productDevelopmentKind: 'series',
+          metadata: {
+            componentDetailType: 'asset-series-components',
+            sourceSeriesCode: 'DBZ',
+          },
+          openingReference: {
+            productName: '单板桌 部件开发明细',
+            temporaryCode: 'DBZ-SPJ',
+          },
+          skuItems: [],
+        },
+      },
+    ] as never)
+    mockedIntakeNonIntegratedProductRepository.findBySpu.mockResolvedValueOnce({
+      id: 'jst-stock-1c617912f7581c50',
+      spu: 'DNZ0384',
+      brand: '其他品牌-普通大货',
+    } as never)
+    mockedAssetVariantRepository.findActiveBySeriesCode.mockResolvedValueOnce([] as never)
+
+    try {
+      const result = await assetCenterService.ensureSeriesComponentDetailProduct(
+        configuredSeries.id,
+        { id: 'user-2' } as never,
+      )
+
+      expect(result).toMatchObject({
+        productId: 'DBZ-SPJ-1780539433902',
+        spu: 'DNZ0384',
+        componentSpu: 'DNZ0384',
+        finishedProductSpu: 'DNZ0385',
+        created: false,
+      })
+      expect(mockedIntakeNonIntegratedProductRepository.findBySpu).toHaveBeenCalledWith(
+        'DNZ0384',
+        'DBZ-SPJ-1780539433902',
+        '其他品牌-普通大货',
+      )
+      expect(syncSpy).toHaveBeenCalledWith(
+        expect.objectContaining({
+          productId: 'DBZ-SPJ-1780539433902',
+          updatedBy: 'user-2',
+          productInput: expect.objectContaining({
+            id: 'DBZ-SPJ-1780539433902',
+            spu: 'PJ0039',
+            productCode: 'DNZ0384',
+            metadata: expect.objectContaining({
+              componentSpu: 'DNZ0384',
+              finishedProductSpu: 'DNZ0385',
+              sourceSeriesCode: 'DBZ',
+            }),
+            openingReference: expect.objectContaining({
+              temporaryCode: '',
+            }),
+          }),
+        }),
+      )
+    } finally {
+      syncSpy.mockRestore()
+    }
+  })
+
   it('配置部件SPU后允许按该SPU保存部件型号和规格款', async () => {
     const customSeries = {
       ...defaultAssetSeries,
diff --git a/furniture-3d-system/src/server/services/asset-center.service.ts b/furniture-3d-system/src/server/services/asset-center.service.ts
index 7047bb27..ec2f248e 100644
--- a/furniture-3d-system/src/server/services/asset-center.service.ts
+++ b/furniture-3d-system/src/server/services/asset-center.service.ts
@@ -1080,8 +1080,9 @@ function buildSeriesComponentDetailProductPayload(input: {
 }
 
 function buildSeriesComponentDetailProductPayloadFromExistingRecord(input: {
-  record: { id: string; payload: Prisma.JsonValue }
+  record: { id: string; payload: Prisma.JsonValue; spu?: string | null }
   series: AssetSeriesDTO
+  preservePersistedSpu?: boolean
 }): Record<string, unknown> {
   const payload = isRecord(input.record.payload) ? input.record.payload : {}
   const metadata = isRecord(payload.metadata) ? payload.metadata : {}
@@ -1093,6 +1094,11 @@ function buildSeriesComponentDetailProductPayloadFromExistingRecord(input: {
   const productName = buildSeriesComponentProductName(input.series)
   const existingPayloadSpu =
     typeof payload.spu === 'string' ? payload.spu.trim().toUpperCase() : ''
+  const existingRecordSpu =
+    typeof input.record.spu === 'string' ? input.record.spu.trim().toUpperCase() : ''
+  const persistedSpu = input.preservePersistedSpu
+    ? existingPayloadSpu || existingRecordSpu || spu
+    : spu
   const existingComponentSpu =
     typeof metadata.componentSpu === 'string'
       ? metadata.componentSpu.trim().toUpperCase()
@@ -1115,7 +1121,7 @@ function buildSeriesComponentDetailProductPayloadFromExistingRecord(input: {
       componentSpu: spu,
       finishedProductSpu,
     },
-    spu,
+    spu: persistedSpu,
     productCode: spu,
     openingReference: {
       ...openingReference,
@@ -2474,6 +2480,13 @@ class AssetCenterService {
     const existingSummary = readSeriesComponentDetailSummaryFromRecord(existingRecord, false)
     const existingRecordSpu = existingRecord.spu.trim().toUpperCase()
     const existingSummarySpu = existingSummary?.spu.trim().toUpperCase() ?? existingRecordSpu
+    const conflictingSpuRecord = await intakeNonIntegratedProductRepository.findBySpu(
+      spu,
+      existingRecord.id,
+      typeof existingRecord.brand === 'string' ? existingRecord.brand : undefined,
+    )
+    const preservePersistedSpu = Boolean(conflictingSpuRecord)
+    const expectedPersistedSpu = preservePersistedSpu ? existingRecordSpu : spu
     const existingComponentSpu = existingSummary?.componentSpu ?? null
     const existingFinishedProductSpu = existingSummary?.finishedProductSpu ?? null
     const payload = isRecord(existingRecord.payload) ? existingRecord.payload : null
@@ -2498,8 +2511,8 @@ class AssetCenterService {
     )
 
     const alreadySynced =
-      existingRecordSpu === spu &&
-      existingSummarySpu === spu &&
+      existingRecordSpu === expectedPersistedSpu &&
+      existingSummarySpu === expectedPersistedSpu &&
       existingComponentSpu === spu &&
       existingFinishedProductSpu === finishedProductSpu &&
       !existingTemporaryCodeIsSpu
@@ -2510,6 +2523,7 @@ class AssetCenterService {
         productInput: buildSeriesComponentDetailProductPayloadFromExistingRecord({
           record: existingRecord,
           series: input.series,
+          preservePersistedSpu,
         }),
         updatedBy: updatedById,
       })
@@ -2678,6 +2692,13 @@ class AssetCenterService {
       const existingSummary = readSeriesComponentDetailSummaryFromRecord(existingRecord, false)
       const existingRecordSpu = existingRecord.spu.trim().toUpperCase()
       const existingSummarySpu = existingSummary?.spu.trim().toUpperCase() ?? existingRecordSpu
+      const conflictingSpuRecord = await intakeNonIntegratedProductRepository.findBySpu(
+        spu,
+        existingRecord.id,
+        typeof existingRecord.brand === 'string' ? existingRecord.brand : undefined,
+      )
+      const preservePersistedSpu = Boolean(conflictingSpuRecord)
+      const expectedPersistedSpu = preservePersistedSpu ? existingRecordSpu : spu
       const existingComponentSpu = existingSummary?.componentSpu ?? null
       const existingFinishedProductSpu = existingSummary?.finishedProductSpu ?? null
       const payload = isRecord(existingRecord.payload) ? existingRecord.payload : null
@@ -2701,8 +2722,8 @@ class AssetCenterService {
             .some((item) => item.trim().toUpperCase() === existingTemporaryCode),
       )
       if (
-        existingRecordSpu !== spu ||
-        existingSummarySpu !== spu ||
+        existingRecordSpu !== expectedPersistedSpu ||
+        existingSummarySpu !== expectedPersistedSpu ||
         existingComponentSpu !== spu ||
         existingFinishedProductSpu !== finishedProductSpu ||
         existingTemporaryCodeIsSpu
@@ -2712,6 +2733,7 @@ class AssetCenterService {
           productInput: buildSeriesComponentDetailProductPayloadFromExistingRecord({
             record: existingRecord,
             series,
+            preservePersistedSpu,
           }),
           updatedBy: user.id,
         })