diff --git a/src/abnormal/abnormal.service.spec.ts b/src/abnormal/abnormal.service.spec.ts
index a9133bd..60b7c9b 100644
--- a/src/abnormal/abnormal.service.spec.ts
+++ b/src/abnormal/abnormal.service.spec.ts
@@ -176,8 +176,11 @@ describe('AbnormalService', () => {
   });
 
   it('list 按 abnormal_type/notify_status/handle_status/老人 筛选', async () => {
-    const recordAbnormalFindMany = vi.fn().mockResolvedValue([{ id: 'a1' }]);
-    const recordAbnormalCount = vi.fn().mockResolvedValue(1);
+    const recordAbnormalFindMany = vi.fn().mockResolvedValue([
+      { id: 'a1', visitLat: { toString: () => '25.010000' }, visitLng: { toString: () => '102.700000' } },
+      { id: 'a2', visitLat: null, visitLng: null },
+    ]);
+    const recordAbnormalCount = vi.fn().mockResolvedValue(2);
     const { service } = makeService({ recordAbnormalFindMany, recordAbnormalCount });
 
     const res = await runWithRequestContext(ctx, () =>
@@ -199,6 +202,15 @@ describe('AbnormalService', () => {
       take: 20,
     });
     expect(recordAbnormalCount).toHaveBeenCalledWith({ where });
-    expect(res).toEqual({ list: [{ id: 'a1' }], total: 1, page: 1, pageSize: 20 });
+    // Decimal → string（null 保持 null）。
+    expect(res).toEqual({
+      list: [
+        { id: 'a1', visitLat: '25.010000', visitLng: '102.700000' },
+        { id: 'a2', visitLat: null, visitLng: null },
+      ],
+      total: 2,
+      page: 1,
+      pageSize: 20,
+    });
   });
 });
diff --git a/src/abnormal/abnormal.service.ts b/src/abnormal/abnormal.service.ts
index 7bc30c5..55a52de 100644
--- a/src/abnormal/abnormal.service.ts
+++ b/src/abnormal/abnormal.service.ts
@@ -87,7 +87,17 @@ export class AbnormalService {
       }),
       this.prisma.client.recordAbnormal.count({ where }),
     ]);
-    return { list, total, page: q.page, pageSize: q.pageSize };
+    // Prisma Decimal（visit_lat/visit_lng）经 TransformInterceptor 不会转字符串，会泄漏为 {s,e,d}；显式序列化。
+    return {
+      list: list.map((r) => ({
+        ...r,
+        visitLat: r.visitLat != null ? r.visitLat.toString() : null,
+        visitLng: r.visitLng != null ? r.visitLng.toString() : null,
+      })),
+      total,
+      page: q.page,
+      pageSize: q.pageSize,
+    };
   }
 
   /** 扑空证据必留：到访时间、定位（经纬）、原因、关联工单（3003）。 */