diff --git a/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/CourseManagementServiceImpl.java b/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/CourseManagementServiceImpl.java
index 7c9f2e9b..200a8d4e 100644
--- a/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/CourseManagementServiceImpl.java
+++ b/safety-cedu-service/src/main/java/org/qinan/cedu/service/impl/CourseManagementServiceImpl.java
@@ -62,7 +62,7 @@ public class CourseManagementServiceImpl extends ServiceImpl<CourseManagementMap
         IPage<CourseManagementVO> convert = page.convert(courseManagementConvertor::convertEToVo);
         Map<Long, Integer> collectMap = classCourseMapper.selectList(new LambdaQueryWrapper<ClassCourseDO>()
                         .in(ClassCourseDO::getCourseId, convert.getRecords().stream().map(CourseManagementVO::getId)))
-                .stream().collect(Collectors.toMap(ClassCourseDO::getCourseId, v -> 1));
+                .stream().map(ClassCourseDO::getCourseId).distinct().collect(Collectors.toMap(v -> v, v -> 1));
         convert.getRecords().forEach(vo -> {
             vo.setCourseRelCoursewareVOList(courseRelCoursewareConvertor.convertEListToVoList(
                     courseRelCoursewareMapper.selectList(new LambdaQueryWrapper<CourseRelCoursewareDO>()
@@ -81,11 +81,15 @@ public class CourseManagementServiceImpl extends ServiceImpl<CourseManagementMap
                 .eq(CourseManagementDO::getDeleteEnum, DeleteEnum.FALSE.getCode())
                 .one();
         CourseManagementVO courseManagementVO = courseManagementConvertor.convertEToVo(entity);
+        Map<Long, Integer> collectMap = classCourseMapper.selectList(new LambdaQueryWrapper<ClassCourseDO>()
+                        .eq(ClassCourseDO::getCourseId, courseManagementVO.getId()))
+                .stream().map(ClassCourseDO::getCourseId).distinct().collect(Collectors.toMap(v -> v, v -> 1));
         courseManagementVO.setCourseRelCoursewareVOList(courseRelCoursewareConvertor.convertEListToVoList(
                 courseRelCoursewareMapper.selectList(new LambdaQueryWrapper<CourseRelCoursewareDO>()
                         .eq(CourseRelCoursewareDO::getCourseId, courseManagementVO.getId())
                         .orderByAsc(CourseRelCoursewareDO::getSort))
         ));
+        courseManagementVO.setUsed(Math.toIntExact(collectMap.getOrDefault(Long.valueOf(courseManagementVO.getId()), 0)));
         return courseManagementVO;
     }