diff --git a/furniture-3d-system/src/app/api/supply-chain/product-sabc/departments/export/route.ts b/furniture-3d-system/src/app/api/supply-chain/product-sabc/departments/export/route.ts
index 9c4dcc00..3d99f135 100644
--- a/furniture-3d-system/src/app/api/supply-chain/product-sabc/departments/export/route.ts
+++ b/furniture-3d-system/src/app/api/supply-chain/product-sabc/departments/export/route.ts
@@ -60,6 +60,7 @@ function applyMetricFormats(sheet: XLSX.WorkSheet, rowCount: number, startColumn
 
 export async function GET(request: NextRequest) {
   return handleRequest(request, async (ctx) => {
+    const startedAt = Date.now()
     const access = await supplyChainPermissionSettingsService.getUserAccess(ctx.user, 'businessManagement')
     if (!access.view) {
       return jsonError(ErrorCode.AUTH_PERMISSION_DENIED, '当前账号没有商品 SABC 查看权限', 403, ctx.requestId)
@@ -139,7 +140,12 @@ export async function GET(request: NextRequest) {
       XLSX.utils.book_append_sheet(workbook, sheet, sheetName)
     }
 
-    const content = XLSX.write(workbook, { type: 'buffer', bookType: 'xlsx' }) as Buffer
+    const content = XLSX.write(workbook, { type: 'buffer', bookType: 'xlsx', compression: true }) as Buffer
+    console.info('[department-distribution] 导出完成', {
+      block,
+      bytes: content.length,
+      ms: Date.now() - startedAt,
+    })
     const stamp = new Date().toISOString().slice(0, 19).replace(/[-:T]/g, '')
     const blockLabel = block === 'operations' ? '-运营中心' : block === 'designers' ? '-产品中心' : block === 'purchasers' ? '-采购中心' : ''
     let exportedRows = 0
diff --git a/furniture-3d-system/src/app/api/supply-chain/product-sabc/export/route.ts b/furniture-3d-system/src/app/api/supply-chain/product-sabc/export/route.ts
index f7cd5d6c..c55fc7c4 100644
--- a/furniture-3d-system/src/app/api/supply-chain/product-sabc/export/route.ts
+++ b/furniture-3d-system/src/app/api/supply-chain/product-sabc/export/route.ts
@@ -166,6 +166,7 @@ async function appendOverviewSheets(input: {
 
 export async function GET(request: NextRequest) {
   return handleRequest(request, async (ctx) => {
+    const startedAt = Date.now()
     const access = await supplyChainPermissionSettingsService.getUserAccess(ctx.user, 'businessManagement')
     if (!access.download) {
       return jsonError(ErrorCode.AUTH_PERMISSION_DENIED, '当前账号没有导出权限', 403, ctx.requestId)
@@ -202,7 +203,14 @@ export async function GET(request: NextRequest) {
     if (parsed.data.mode !== 'detail') {
       await appendOverviewSheets({ workbook, rows, year: parsed.data.year, month: parsed.data.month })
     }
-    const content = XLSX.write(workbook, { type: 'buffer', bookType: 'xlsx' }) as Buffer
+    // compression 打开后文件体积约为原来的 1/4（8 月全量 66MB → 17MB），正式环境下载更稳
+    const content = XLSX.write(workbook, { type: 'buffer', bookType: 'xlsx', compression: true }) as Buffer
+    console.info('[product-sabc] 导出完成', {
+      mode: parsed.data.mode,
+      rows: rows.length,
+      bytes: content.length,
+      ms: Date.now() - startedAt,
+    })
 
     return new NextResponse(new Uint8Array(content), {
       status: 200,
diff --git a/furniture-3d-system/src/app/supply-chain/management/blank-pages/DepartmentDistributionView.tsx b/furniture-3d-system/src/app/supply-chain/management/blank-pages/DepartmentDistributionView.tsx
index 6cd41437..b6086048 100644
--- a/furniture-3d-system/src/app/supply-chain/management/blank-pages/DepartmentDistributionView.tsx
+++ b/furniture-3d-system/src/app/supply-chain/management/blank-pages/DepartmentDistributionView.tsx
@@ -212,7 +212,7 @@ export function DepartmentDistributionView({
       const response = await fetch(`/api/supply-chain/product-sabc/departments/export?${params}`, { cache: 'no-store' })
       if (!response.ok) {
         const payload = await response.json().catch(() => null)
-        throw new Error(payload?.error?.message || '导出失败')
+        throw new Error(payload?.error?.message || `导出失败（HTTP ${response.status}）`)
       }
       const blob = await response.blob()
       const disposition = response.headers.get('Content-Disposition') ?? ''
@@ -227,7 +227,7 @@ export function DepartmentDistributionView({
       link.remove()
       window.URL.revokeObjectURL(url)
     } catch (cause) {
-      setError(cause instanceof Error ? cause.message : '导出失败')
+      setError(cause instanceof Error ? `导出失败：${cause.message}` : '导出失败')
     } finally {
       setExporting(false)
     }
diff --git a/furniture-3d-system/src/app/supply-chain/management/blank-pages/ProductSabcView.tsx b/furniture-3d-system/src/app/supply-chain/management/blank-pages/ProductSabcView.tsx
index 71259bcf..3f758c80 100644
--- a/furniture-3d-system/src/app/supply-chain/management/blank-pages/ProductSabcView.tsx
+++ b/furniture-3d-system/src/app/supply-chain/management/blank-pages/ProductSabcView.tsx
@@ -243,7 +243,7 @@ export function ProductSabcView({ definition, canCalculate, canDownload }: { def
       const response = await fetch(`/api/supply-chain/product-sabc/export?${params}`, { cache: 'no-store' })
       if (!response.ok) {
         const payload = await response.json().catch(() => null)
-        throw new Error(payload?.error?.message || '导出失败')
+        throw new Error(payload?.error?.message || `导出失败（HTTP ${response.status}）`)
       }
       const blob = await response.blob()
       const disposition = response.headers.get('Content-Disposition') || ''
@@ -260,7 +260,8 @@ export function ProductSabcView({ definition, canCalculate, canDownload }: { def
       const modeLabel = mode === 'detail' ? '明细' : mode === 'detailOverview' ? '明细（含经营总览）' : '经营总览'
       setMessage(`导出完成（${modeLabel}）：${response.headers.get('X-Exported-Row-Count') || '全部'} 条`)
     } catch (cause) {
-      setError(cause instanceof Error ? cause.message : '导出失败')
+      // 常见失败：文件太大被网关截断/超时、进程内存不足（表现为网络错误）
+      setError(cause instanceof Error ? `导出失败：${cause.message}` : '导出失败')
     } finally {
       setExporting(false)
     }