diff --git a/backend/services/planting-service/src/application/services/contract-signing.service.ts b/backend/services/planting-service/src/application/services/contract-signing.service.ts
index f2d3a9e1..96a7b0b4 100644
--- a/backend/services/planting-service/src/application/services/contract-signing.service.ts
+++ b/backend/services/planting-service/src/application/services/contract-signing.service.ts
@@ -67,8 +67,8 @@ export interface ContractSigningTaskDto {
 export class ContractSigningService {
   private readonly logger = new Logger(ContractSigningService.name);
 
-  // 签署有效期（24小时）
-  private static readonly SIGNING_EXPIRY_HOURS = 24;
+  // 签署有效期（1年）
+  private static readonly SIGNING_EXPIRY_HOURS = 24 * 365;
 
   constructor(
     @Inject(CONTRACT_TEMPLATE_REPOSITORY)