diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/controller/ProjectGroupController.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/controller/ProjectGroupController.java
index b2a9c47..ca14ace 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/controller/ProjectGroupController.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/controller/ProjectGroupController.java
@@ -78,9 +78,9 @@ public class ProjectGroupController {
     public ResponseMap addGroupMember(
             @RequestHeader("Token") String token,
             @PathVariable Integer projectId,
-            @RequestBody GroupPositionVO groupPosition
+            @Parameter(description = "只传staffUsername和projectStaffPosition") @RequestBody GroupPositionVO groupPosition
     ) {
-        if (projectGroupService.insertNewMember(token, projectId, groupPosition.getStaffId(), groupPosition.getPositions())) {
+        if (projectGroupService.insertNewMember(token, projectId, groupPosition.getStaffUsername(), groupPosition.getProjectStaffPosition())) {
             return ResponseMap.ofSuccess();
         }
         throw new BadRequestException(BadRequestException.OPERATE_FAILED);
@@ -93,9 +93,9 @@ public class ProjectGroupController {
             @RequestHeader("Token") String token,
             @PathVariable Integer projectId,
             @PathVariable Integer staffId,
-            @Parameter(description = "不需要在body中传递staffId，用path传递") @RequestBody GroupPositionVO groupPosition
+            @Parameter(description = "在body中只传projectStaffPosition") @RequestBody GroupPositionVO groupPosition
     ) {
-        if (projectGroupService.updateStaffPositions(token, staffId, projectId, groupPosition.getPositions())) {
+        if (projectGroupService.updateStaffPositions(token, staffId, projectId, groupPosition.getProjectStaffPosition())) {
             return ResponseMap.ofSuccess();
         }
         throw new BadRequestException(BadRequestException.OPERATE_FAILED);
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/vo/GroupPositionVO.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/vo/GroupPositionVO.java
index 65c313b..5477773 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/vo/GroupPositionVO.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/entity/vo/GroupPositionVO.java
@@ -9,5 +9,6 @@ import lombok.Data;
 @Data
 public class GroupPositionVO {
     private Integer staffId;
-    private String positions;
+    private String staffUsername;
+    private String projectStaffPosition;
 }
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IProjectGroupService.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IProjectGroupService.java
index 5a20759..140afd4 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IProjectGroupService.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IProjectGroupService.java
@@ -2,6 +2,7 @@ package cn.edu.hfut.rmdjzz.projectmanagement.service;
 
 import cn.edu.hfut.rmdjzz.projectmanagement.entity.ProjectGroup;
 import cn.edu.hfut.rmdjzz.projectmanagement.entity.dto.ProjectGroupDTO;
+import cn.edu.hfut.rmdjzz.projectmanagement.exception.BadRequestException;
 import cn.edu.hfut.rmdjzz.projectmanagement.exception.ForbiddenException;
 import cn.edu.hfut.rmdjzz.projectmanagement.utils.http.RequestPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
@@ -23,7 +24,7 @@ public interface IProjectGroupService extends IService<ProjectGroup> {
 
     Boolean addCreator(Integer projectId, Integer staffId);
 
-    Boolean insertNewMember(String token, Integer projectId, Integer staffId, String positions) throws ForbiddenException;
+    Boolean insertNewMember(String token, Integer projectId, String staffUsername, String positions) throws ForbiddenException, BadRequestException;
 
     Boolean updateStaffPositions(String token, Integer projectId, Integer targetId, String positions) throws ForbiddenException;
 
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IStaffService.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IStaffService.java
index 7087c92..56525ff 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IStaffService.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/IStaffService.java
@@ -14,6 +14,9 @@ import java.util.Map;
  * @since 2022/6/28 17:28
  */
 public interface IStaffService extends IService<Staff> {
+
+    String STAFF_DOES_NOT_EXIST = "用户不存在";
+
     Map<String, Object> login(String username, String password) throws BadRequestException, TokenException;
 
     Boolean logout(String token) throws TokenException;
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 be7b6f0..e133588 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
@@ -1,15 +1,19 @@
 package cn.edu.hfut.rmdjzz.projectmanagement.service.impl;
 
 import cn.edu.hfut.rmdjzz.projectmanagement.entity.ProjectGroup;
+import cn.edu.hfut.rmdjzz.projectmanagement.entity.Staff;
 import cn.edu.hfut.rmdjzz.projectmanagement.entity.dto.ProjectGroupDTO;
+import cn.edu.hfut.rmdjzz.projectmanagement.exception.BadRequestException;
 import cn.edu.hfut.rmdjzz.projectmanagement.exception.ForbiddenException;
 import cn.edu.hfut.rmdjzz.projectmanagement.mapper.ProjectGroupMapper;
 import cn.edu.hfut.rmdjzz.projectmanagement.service.IProjectGroupService;
+import cn.edu.hfut.rmdjzz.projectmanagement.service.IStaffService;
 import cn.edu.hfut.rmdjzz.projectmanagement.utils.TokenUtils;
 import cn.edu.hfut.rmdjzz.projectmanagement.utils.http.RequestPage;
 import com.baomidou.mybatisplus.core.toolkit.Wrappers;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import java.util.HashMap;
@@ -22,6 +26,10 @@ import java.util.Map;
  */
 @Service
 public class ProjectGroupServiceImpl extends ServiceImpl<ProjectGroupMapper, ProjectGroup> implements IProjectGroupService {
+
+    @Autowired
+    private IStaffService staffService;
+
     @Override
     public Boolean addCreator(Integer projectId, Integer staffId) {
         if (projectId == null || staffId == null)
@@ -35,10 +43,15 @@ public class ProjectGroupServiceImpl extends ServiceImpl<ProjectGroupMapper, Pro
     }
 
     @Override
-    public Boolean insertNewMember(String token, Integer projectId, Integer targetId, String positions) throws ForbiddenException {
+    public Boolean insertNewMember(String token, Integer projectId, String targetUsername, String positions) throws ForbiddenException, BadRequestException {
         int accessLevel = getProjectAccessLevel(token, projectId);
         int targetLevel = 3;
 
+        Staff targetStaff = staffService.getOne(Wrappers.<Staff>lambdaQuery().eq(Staff::getStaffUsername, targetUsername));
+        if (targetStaff == null) {
+            throw new BadRequestException(IStaffService.STAFF_DOES_NOT_EXIST);
+        }
+
         if (accessLevel == 0) {
             throw new ForbiddenException(IProjectGroupService.UNABLE_TO_ACCESS_PROJECT);
         }
@@ -58,7 +71,7 @@ public class ProjectGroupServiceImpl extends ServiceImpl<ProjectGroupMapper, Pro
             }
         }
 
-        return baseMapper.insert(new ProjectGroup(targetId, projectId, positions, targetLevel)) == 1;
+        return baseMapper.insert(new ProjectGroup(targetStaff.getStaffId(), projectId, positions, targetLevel)) == 1;
     }
 
     @Override
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/StaffServiceImpl.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/StaffServiceImpl.java
index 806311f..0fcbf20 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/StaffServiceImpl.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/StaffServiceImpl.java
@@ -50,7 +50,7 @@ public class StaffServiceImpl extends ServiceImpl<StaffMapper, Staff> implements
 
         Staff staff = getOne(Wrappers.<Staff>lambdaQuery().eq(Staff::getStaffUsername, staffUsername));
         if (staff == null)
-            throw new BadRequestException("用户不存在");
+            throw new BadRequestException(STAFF_DOES_NOT_EXIST);
         password = DigestUtils.md5DigestAsHex((password + staff.getStaffSalt()).getBytes());
         if (!staff.getStaffPassword().equals(password))
             throw new BadRequestException("密码错误");
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/utils/http/RequestPage.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/utils/http/RequestPage.java
index 289e356..e13f744 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/utils/http/RequestPage.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/utils/http/RequestPage.java
@@ -29,6 +29,7 @@ public class RequestPage {
     @Schema(description = "传true或空时为顺序排序，否则倒序排序")
     Boolean asc;
 
+    @Schema(hidden = true)
     public <T> IPage<T> getPage() {
         Page<T> page = new Page<>(pageCurrent, pageSize);
         if (StringUtils.isNotBlank(sortBy)) {