diff --git a/zt-module-contract-order/zt-module-contract-order-server/src/main/java/com/zt/plat/module/contractorder/service/contract/ContractServiceImpl.java b/zt-module-contract-order/zt-module-contract-order-server/src/main/java/com/zt/plat/module/contractorder/service/contract/ContractServiceImpl.java
index ab19798..07abdea 100644
--- a/zt-module-contract-order/zt-module-contract-order-server/src/main/java/com/zt/plat/module/contractorder/service/contract/ContractServiceImpl.java
+++ b/zt-module-contract-order/zt-module-contract-order-server/src/main/java/com/zt/plat/module/contractorder/service/contract/ContractServiceImpl.java
@@ -921,8 +921,10 @@ public class ContractServiceImpl implements ContractService {
         }
 
         // 更新合同主信息
+        Long instanceId = newContractMainDO.getInstanceId();
+        newContractMainDO.setInstanceId(null);
         contractMainMapper.update(newContractMainDO, new LambdaUpdateWrapper<>(ContractMainDO.class)
-                .set(ContractMainDO::getInstanceId, newContractMainDO.getInstanceId())
+                .set(ContractMainDO::getInstanceId, instanceId)
                 .eq(ContractMainDO::getId, newContractMainDO.getId()));
 
         if (DictEnum.BSE_CTRT_STS_IN_PROGRESS.getCode().equals(newContractMainDO.getStatus())) {