diff --git a/backend/services/planting-service/src/pre-planting/application/services/pre-planting-application.service.ts b/backend/services/planting-service/src/pre-planting/application/services/pre-planting-application.service.ts
index 46c7fbc5..22f94a89 100644
--- a/backend/services/planting-service/src/pre-planting/application/services/pre-planting-application.service.ts
+++ b/backend/services/planting-service/src/pre-planting/application/services/pre-planting-application.service.ts
@@ -368,6 +368,7 @@ export class PrePlantingApplicationService {
   async getMerges(userId: bigint): Promise<{
     mergeNo: string;
     sourceOrderNos: string[];
+    totalPortions: number;
     treeCount: number;
     contractStatus: string;
     contractSignedAt: Date | null;
@@ -376,9 +377,20 @@ export class PrePlantingApplicationService {
   }[]> {
     return this.prisma.$transaction(async (tx) => {
       const merges = await this.mergeRepo.findByUserId(tx, userId);
+      if (merges.length === 0) return [];
+
+      // 批量查询所有合并的来源订单份数
+      const allOrderNos = merges.flatMap((m) => m.sourceOrderNos);
+      const orderRecords = await tx.prePlantingOrder.findMany({
+        where: { orderNo: { in: allOrderNos } },
+        select: { orderNo: true, portionCount: true },
+      });
+      const portionByOrderNo = new Map(orderRecords.map((o) => [o.orderNo, o.portionCount]));
+
       return merges.map((m) => ({
         mergeNo: m.mergeNo,
         sourceOrderNos: m.sourceOrderNos,
+        totalPortions: m.sourceOrderNos.reduce((sum, no) => sum + (portionByOrderNo.get(no) ?? 1), 0),
         treeCount: m.treeCount,
         contractStatus: m.contractStatus,
         contractSignedAt: m.contractSignedAt,
diff --git a/frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_position_page.dart b/frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_position_page.dart
index de126c9a..10a2a326 100644
--- a/frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_position_page.dart
+++ b/frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_position_page.dart
@@ -669,7 +669,7 @@ class _PrePlantingPositionPageState
                 const SizedBox(width: 16),
                 _buildInfoChip(
                   Icons.layers_outlined,
-                  '${merge.sourceOrderNos.length} 份合并',
+                  '${merge.totalPortions > 0 ? merge.totalPortions : merge.sourceOrderNos.length} 份合并',
                 ),
               ],
             ),