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 ed598bb..6ba847b 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
@@ -94,7 +94,7 @@ public class ProjectGroupController {
             @PathVariable Integer projectId,
             @PathVariable Integer staffId
     ) {
-        if (projectGroupService.compareProjectAccessLevel(projectId, token, staffId) <= 0) {
+        if (projectGroupService.compareProjectAccessLevel(projectId, token, staffId) >= 0) {
             throw new ForbiddenException(ForbiddenException.UNABLE_TO_OPERATE);
         }
         if (projectGroupService.remove(Wrappers.<ProjectGroup>lambdaQuery()
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 140afd4..cb579ca 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
@@ -45,7 +45,7 @@ public interface IProjectGroupService extends IService<ProjectGroup> {
      * <p>
      * token持有者的判断受全局权限影响，目标id不会
      * <p>
-     * 返回类似于{@link Integer#compare(int, int)}
+     * 返回类似于{@link Integer#compare(int, int)}，推荐使用compareProjectAccessLevel(...)>(或其他逻辑判断符)0，若<则token持有者拥有更高权限
      */
     Integer compareProjectAccessLevel(Integer projectId, String token, Integer targetId);
 
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/AnnouncementServiceImpl.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/AnnouncementServiceImpl.java
index 0f45eab..7ba73ce 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/AnnouncementServiceImpl.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/AnnouncementServiceImpl.java
@@ -71,7 +71,7 @@ public class AnnouncementServiceImpl extends ServiceImpl<AnnouncementMapper, Ann
         if (!Objects.equals(projectId, rawAnnouncement.getProjectId())) {
             throw new BadRequestException(BadRequestException.WRONG_PARAMETERS);
         }
-        if (projectGroupService.compareProjectAccessLevel(projectId, token, rawAnnouncement.getAnnouncementPublisherId()) < 0) {
+        if (projectGroupService.compareProjectAccessLevel(projectId, token, rawAnnouncement.getAnnouncementPublisherId()) > 0) {
             throw new ForbiddenException(ForbiddenException.UNABLE_TO_OPERATE);
         }
         return removeById(announcementId);
diff --git a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java
index 13be26c..3d83b73 100644
--- a/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java
+++ b/src/main/java/cn/edu/hfut/rmdjzz/projectmanagement/service/impl/TaskServiceImpl.java
@@ -443,7 +443,7 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
                 || projectGroupService.getProjectAccessLevelIgnoreGlobalLevel(transferredStaffId, projectId) == 0) {
             throw new ForbiddenException(IProjectGroupService.UNABLE_TO_ACCESS_PROJECT);
         }
-        if (projectGroupService.compareProjectAccessLevel(projectId, token, transferredStaffId) < 0) {
+        if (projectGroupService.compareProjectAccessLevel(projectId, token, transferredStaffId) > 0) {
             throw new ForbiddenException(ForbiddenException.UNABLE_TO_OPERATE);
         }
 
@@ -498,7 +498,7 @@ public class TaskServiceImpl extends ServiceImpl<TaskMapper, Task> implements IT
                 || projectGroupService.getProjectAccessLevelIgnoreGlobalLevel(targetStaffId, projectId) == 0) {
             throw new ForbiddenException(IProjectGroupService.UNABLE_TO_ACCESS_PROJECT);
         }
-        if (projectGroupService.compareProjectAccessLevel(projectId, token, transferredStaffId) < 0) {
+        if (projectGroupService.compareProjectAccessLevel(projectId, token, transferredStaffId) > 0) {
             throw new ForbiddenException(ForbiddenException.UNABLE_TO_OPERATE);
         }
         Long transferredTaskCount = baseMapper.selectCount(Wrappers.<Task>lambdaQuery().eq(Task::getTaskHolderId, transferredStaffId));