diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/domain/bo/ErpProjectInfoBo.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/domain/bo/ErpProjectInfoBo.java
index f6b84ea0..7534e293 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/domain/bo/ErpProjectInfoBo.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/domain/bo/ErpProjectInfoBo.java
@@ -164,6 +164,11 @@ public class ErpProjectInfoBo extends BaseEntity {
      */
     private List<ErpProjectPlanStageBo> planStageList;
 
+    /**
+     * 项目关联合同列表
+     */
+    private List<ErpProjectContractsBo> projectContractsList;
+
     public Map<String, Object> getVariables() {
         if (variables == null) {
             return new HashMap<>(16);
diff --git a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectInfoServiceImpl.java b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectInfoServiceImpl.java
index ddf6cd8c..77387b5f 100644
--- a/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectInfoServiceImpl.java
+++ b/ruoyi-modules/ruoyi-oa/src/main/java/org/dromara/oa/erp/service/impl/ErpProjectInfoServiceImpl.java
@@ -23,6 +23,9 @@ import org.dromara.oa.erp.domain.vo.ErpProjectInfoVo;
 import org.dromara.oa.erp.domain.ErpProjectInfo;
 import org.dromara.oa.erp.mapper.ErpProjectInfoMapper;
 import org.dromara.oa.erp.service.IErpProjectInfoService;
+import org.dromara.oa.erp.domain.bo.ErpProjectContractsBo;
+import org.dromara.oa.erp.domain.ErpProjectContracts;
+import org.dromara.oa.erp.mapper.ErpProjectContractsMapper;
 import org.apache.dubbo.config.annotation.DubboReference;
 import org.apache.seata.spring.annotation.GlobalTransactional;
 import org.dromara.common.core.exception.ServiceException;
@@ -33,6 +36,9 @@ import java.util.List;
 import java.util.Map;
 import java.util.Collection;
 import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.springframework.transaction.annotation.Transactional;
 
 /**
  * 项目信息Service业务层处理
@@ -47,6 +53,8 @@ public class ErpProjectInfoServiceImpl implements IErpProjectInfoService {
 
     private final ErpProjectInfoMapper baseMapper;
 
+    private final ErpProjectContractsMapper projectContractsMapper;
+
     @DubboReference(timeout = 30000)
     private RemoteWorkflowService remoteWorkflowService;
 
@@ -125,12 +133,22 @@ public class ErpProjectInfoServiceImpl implements IErpProjectInfoService {
      * @return 是否新增成功
      */
     @Override
+    @Transactional(rollbackFor = Exception.class)
     public Boolean insertByBo(ErpProjectInfoBo bo) {
         ErpProjectInfo add = MapstructUtils.convert(bo, ErpProjectInfo.class);
         validEntityBeforeSave(add);
         boolean flag = baseMapper.insert(add) > 0;
         if (flag) {
             bo.setProjectId(add.getProjectId());
+            // 处理项目关联合同列表
+            List<ErpProjectContractsBo> projectContractsList = bo.getProjectContractsList();
+            if (projectContractsList != null && !projectContractsList.isEmpty()) {
+                for (ErpProjectContractsBo projectContractsBo : projectContractsList) {
+                    projectContractsBo.setProjectId(add.getProjectId());
+                    ErpProjectContracts projectContracts = MapstructUtils.convert(projectContractsBo, ErpProjectContracts.class);
+                    projectContractsMapper.insert(projectContracts);
+                }
+            }
         }
         return flag;
     }
@@ -142,10 +160,57 @@ public class ErpProjectInfoServiceImpl implements IErpProjectInfoService {
      * @return 是否修改成功
      */
     @Override
+    @Transactional(rollbackFor = Exception.class)
     public Boolean updateByBo(ErpProjectInfoBo bo) {
         ErpProjectInfo update = MapstructUtils.convert(bo, ErpProjectInfo.class);
         validEntityBeforeSave(update);
-        return baseMapper.updateById(update) > 0;
+        boolean flag = baseMapper.updateById(update) > 0;
+        if (flag) {
+            // 处理项目关联合同列表
+            List<ErpProjectContractsBo> projectContractsList = bo.getProjectContractsList();
+            // 查询原有的关联合同列表
+            MPJLambdaWrapper<ErpProjectContracts> lqwRecord = JoinWrappers.lambda(ErpProjectContracts.class);
+            lqwRecord.eq(ErpProjectContracts::getProjectId, bo.getProjectId());
+            List<ErpProjectContracts> projectContractsOldList = projectContractsMapper.selectList(lqwRecord);
+            
+            if (projectContractsList != null && !projectContractsList.isEmpty()) {
+                // 获取原有关联合同的ID集合
+                Set<Long> oldProjectContractsIds = projectContractsOldList.stream()
+                        .map(ErpProjectContracts::getProjectContractsId)
+                        .collect(Collectors.toSet());
+                
+                // 保存新的关联合同列表
+                for (ErpProjectContractsBo projectContractsBo : projectContractsList) {
+                    projectContractsBo.setProjectId(bo.getProjectId());
+                    ErpProjectContracts projectContracts = MapstructUtils.convert(projectContractsBo, ErpProjectContracts.class);
+                    // 如果 projectContractsId 为空或不在原列表中，则新增；否则更新
+                    if (projectContracts.getProjectContractsId() == null || !oldProjectContractsIds.contains(projectContracts.getProjectContractsId())) {
+                        projectContracts.setProjectContractsId(null);
+                        projectContractsMapper.insert(projectContracts);
+                    } else {
+                        projectContractsMapper.insertOrUpdate(projectContracts);
+                    }
+                }
+                // 删除不在新列表中的关联合同
+                Set<Long> existingProjectContractsIds = projectContractsList.stream()
+                        .map(ErpProjectContractsBo::getProjectContractsId)
+                        .filter(Objects::nonNull)
+                        .filter(oldProjectContractsIds::contains) // 只处理真实ID（在原列表中存在）
+                        .collect(Collectors.toSet());
+                List<ErpProjectContracts> filterProjectContracts = projectContractsOldList.stream()
+                        .filter(contract -> !existingProjectContractsIds.contains(contract.getProjectContractsId()))
+                        .toList();
+                for (ErpProjectContracts filterProjectContract : filterProjectContracts) {
+                    projectContractsMapper.deleteById(filterProjectContract.getProjectContractsId());
+                }
+            } else if (projectContractsList != null && projectContractsList.isEmpty()) {
+                // 如果新列表为空，删除所有原有关联
+                for (ErpProjectContracts projectContract : projectContractsOldList) {
+                    projectContractsMapper.deleteById(projectContract.getProjectContractsId());
+                }
+            }
+        }
+        return flag;
     }
 
     /**