diff --git a/frontend/mobile-app/lib/core/services/contract_signing_service.dart b/frontend/mobile-app/lib/core/services/contract_signing_service.dart
index b3a31341..14f5a5aa 100644
--- a/frontend/mobile-app/lib/core/services/contract_signing_service.dart
+++ b/frontend/mobile-app/lib/core/services/contract_signing_service.dart
@@ -213,6 +213,10 @@ class ContractSigningService {
         if (responseData['success'] == true && responseData['data'] != null) {
           final data = responseData['data'] as List<dynamic>;
           debugPrint('[ContractSigningService] 未签署任务数量: ${data.length}');
+          // 调试：打印每个任务的 expiresAt
+          for (final item in data) {
+            debugPrint('[ContractSigningService] 任务 ${item['orderNo']} expiresAt: ${item['expiresAt']}');
+          }
           return data.map((e) => ContractSigningTask.fromJson(e)).toList();
         }
         return [];
@@ -233,8 +237,13 @@ class ContractSigningService {
       final response = await _apiClient.get('/planting/contract-signing/tasks/$orderNo');
 
       if (response.statusCode == 200) {
-        final data = response.data as Map<String, dynamic>;
-        return ContractSigningTask.fromJson(data);
+        final responseData = response.data as Map<String, dynamic>;
+        if (responseData['success'] == true && responseData['data'] != null) {
+          final data = responseData['data'] as Map<String, dynamic>;
+          debugPrint('[ContractSigningService] 任务 expiresAt: ${data['expiresAt']}');
+          return ContractSigningTask.fromJson(data);
+        }
+        throw Exception('获取任务失败: ${responseData['message']}');
       }
 
       throw Exception('获取签署任务详情失败: ${response.statusCode}');