diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/ProjectGroup.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/ProjectGroup.java
index 1d467dd..8848f92 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/ProjectGroup.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/ProjectGroup.java
@@ -3,15 +3,15 @@ package cn.edu.hfut.rmdjzz.projectmanagement.entity;
 import com.baomidou.mybatisplus.annotation.IdType;
 import com.baomidou.mybatisplus.annotation.TableId;
 import lombok.AllArgsConstructor;
+import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
-import lombok.experimental.Accessors;
 
 /**
  * @author 张韬
  * created at 2022/6/30 21:31
  */
-@Accessors(chain = true)
+@Builder
 @NoArgsConstructor
 @AllArgsConstructor
 @Data
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/ProjectGroupServiceImpl.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/ProjectGroupServiceImpl.java
index 2c0c050..e1c6d36 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/ProjectGroupServiceImpl.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/ProjectGroupServiceImpl.java
@@ -82,9 +82,10 @@ public class ProjectGroupServiceImpl extends ServiceImpl<ProjectGroupMapper, Pro
         }
 
         baseMapper.update(
-                new ProjectGroup()
-                        .setProjectId(projectId)
-                        .setStaffId(targetId),
+                ProjectGroup.builder()
+                        .projectId(projectId)
+                        .staffId(targetId)
+                        .build(),
                 Wrappers.<ProjectGroup>lambdaUpdate().set(ProjectGroup::getProjectStaffPosition, positions)
         );
     }