diff --git a/src/main/java/com/sztzjy/financial_bigdata/controller/stu/StuKnowledgeNote.java b/src/main/java/com/sztzjy/financial_bigdata/controller/stu/StuKnowledgeNote.java
index 95610db..12f9fba 100644
--- a/src/main/java/com/sztzjy/financial_bigdata/controller/stu/StuKnowledgeNote.java
+++ b/src/main/java/com/sztzjy/financial_bigdata/controller/stu/StuKnowledgeNote.java
@@ -1,7 +1,6 @@
 package com.sztzjy.financial_bigdata.controller.stu;
 
 import cn.hutool.core.util.IdUtil;
-import org.apache.commons.lang3.StringEscapeUtils;
 import com.sztzjy.financial_bigdata.annotation.AnonymousAccess;
 import com.sztzjy.financial_bigdata.entity.StuTrainingExample;
 import com.sztzjy.financial_bigdata.entity.StuTrainingWithBLOBs;
diff --git a/src/main/java/com/sztzjy/financial_bigdata/service/tea/impl/TeaGradeManageServiceImpl.java b/src/main/java/com/sztzjy/financial_bigdata/service/tea/impl/TeaGradeManageServiceImpl.java
index 361c481..4d666e0 100644
--- a/src/main/java/com/sztzjy/financial_bigdata/service/tea/impl/TeaGradeManageServiceImpl.java
+++ b/src/main/java/com/sztzjy/financial_bigdata/service/tea/impl/TeaGradeManageServiceImpl.java
@@ -52,7 +52,7 @@ public class TeaGradeManageServiceImpl implements ITeaGradeManageService {
     @Override
     public PageInfo<TeaTrainingInfoDTO> getTrainingInfo(Integer index, Integer size, String schoolId, String keyWord, String classId) {
         List<TeaTrainingInfoDTO> list = getTeaTrainingInfoDTOS(schoolId, keyWord, classId);
-        assert list != null;
+        assert !list.isEmpty();
         list.sort(new TotalScoreComparator());
         int i = 0;
         for (TeaTrainingInfoDTO teaTrainingInfoDTO : list) {
@@ -287,7 +287,6 @@ public class TeaGradeManageServiceImpl implements ITeaGradeManageService {
     }
 
 
-
     private List<TeaTrainingInfoDTO> getTeaTrainingInfoDTOS(String schoolId, String keyWord, String classId) {
         StuUserExample userExample = new StuUserExample();
         StuUserExample.Criteria criteria = userExample.createCriteria();
@@ -317,7 +316,9 @@ public class TeaGradeManageServiceImpl implements ITeaGradeManageService {
         StuTrainingExample stuTrainingExample = new StuTrainingExample();
         stuTrainingExample.createCriteria().andUserIdIn(new ArrayList<>(userIds));
         List<StuTrainingWithBLOBs> stuTrainingsWithBLOBs = trainingMapper.selectByExampleWithBLOBs(stuTrainingExample);
-
+        if (stuTrainingsWithBLOBs.isEmpty()){
+            return Collections.emptyList();
+        }
         // 实训记录按用户ID分组
         Map<String, List<StuTrainingWithBLOBs>> userIdToTrainingsMap = stuTrainingsWithBLOBs.stream().collect(Collectors.groupingBy(StuTrainingWithBLOBs::getUserId));
 
@@ -325,7 +326,6 @@ public class TeaGradeManageServiceImpl implements ITeaGradeManageService {
         Set<String> reportIds = stuTrainingsWithBLOBs.stream().map(StuTrainingWithBLOBs::getReportId).collect(Collectors.toSet());
         List<TrainingReport> trainingReports = trainingReportMapper.selectByPrimaryKeys(reportIds);
         Map<String, BigDecimal> reportIdToScoreMap = trainingReports.stream().collect(Collectors.toMap(TrainingReport::getReportId, TrainingReport::getTeacherScore));
-
         // 获取总模块数量
         BigDecimal chapterNum = sysCourseChapterMapper.selectChapterBySchoolId(schoolId);
 
@@ -373,9 +373,6 @@ public class TeaGradeManageServiceImpl implements ITeaGradeManageService {
     }
 
 
-
-
-
     public class TotalScoreComparator implements Comparator<TeaTrainingInfoDTO> {
         @Override
         public int compare(TeaTrainingInfoDTO o1, TeaTrainingInfoDTO o2) {