diff --git a/src/main/java/com/sztzjy/resource_center/controller/api/CaseApi.java b/src/main/java/com/sztzjy/resource_center/controller/api/CaseApi.java
index 3721fe6..eeec593 100644
--- a/src/main/java/com/sztzjy/resource_center/controller/api/CaseApi.java
+++ b/src/main/java/com/sztzjy/resource_center/controller/api/CaseApi.java
@@ -18,7 +18,9 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.*;
+import java.util.function.Function;
 import java.util.stream.Collectors;
+import java.util.stream.IntStream;
 
 @RestController
 @Api(tags = "案例题方面API")
@@ -322,12 +324,38 @@ public class CaseApi {
         example.createCriteria().andThreeIdEqualTo(threeId);
         List<SysTopicAndCourse> topicAndCourseList = topicAndCourseMapper.selectByExample(example);
         List<String> caseIdList = topicAndCourseList.stream().map(SysTopicAndCourse::getTopicId).collect(Collectors.toList());
+
+        SysCaseQuestionExample caseQuestionExample =new SysCaseQuestionExample();
+        caseQuestionExample.createCriteria().andCaseIdIn(caseIdList);
+        caseQuestionExample.setOrderByClause("create_time");
+
+        List<SysCaseQuestion> list = caseQuestionMapper.selectByExampleWithBLOBs(caseQuestionExample);
+        List<String> ids = list.stream().map(SysCaseQuestion::getCaseId).collect(Collectors.toList());
         SysCaseQuestionStepExample caseQuestionStepExample = new SysCaseQuestionStepExample();
-        caseQuestionStepExample.createCriteria().andCaseIdIn(caseIdList);
+        caseQuestionStepExample.createCriteria().andCaseIdIn(ids);
         List<SysCaseQuestionStepWithBLOBs> sysCaseQuestionStepWithBLOBs = caseQuestionStepMapper.selectByExampleWithBLOBs(caseQuestionStepExample);
-        return sysCaseQuestionStepWithBLOBs;
+        // 获取原 caseId 的顺序列表
+        Map<String, Integer> indexMap = IntStream.range(0, ids.size())
+                .boxed()
+                .collect(Collectors.toMap(ids::get, Function.identity()));
+
+        // 根据 indexMap 顺序排序
+        List<SysCaseQuestionStepWithBLOBs> sortedSteps = sysCaseQuestionStepWithBLOBs.stream()
+                .sorted(Comparator.comparingInt(step -> indexMap.get(step.getCaseId())))
+                .collect(Collectors.toList());
+        return sortedSteps;
     }
 
+
+    @PostMapping("selectCaseStepByThreeIds")
+    @ApiOperation("查询案例题步骤")
+    @AnonymousAccess
+    public List<SysCaseQuestionStepWithBLOBs> selectCaseStepByThreeIds(@RequestBody List<String> threeIds) {
+        List<SysCaseQuestionStepWithBLOBs> list= caseQuestionStepMapper.selectCaseStepByThreeIds(threeIds);
+        return list;
+    }
+
+
     @PostMapping("selectCaseStepListBatchByIdList")
     @ApiOperation("查询案例题步骤")
     @AnonymousAccess
diff --git a/src/main/java/com/sztzjy/resource_center/controller/api/CourseApi.java b/src/main/java/com/sztzjy/resource_center/controller/api/CourseApi.java
index 85db12b..c19c79a 100644
--- a/src/main/java/com/sztzjy/resource_center/controller/api/CourseApi.java
+++ b/src/main/java/com/sztzjy/resource_center/controller/api/CourseApi.java
@@ -69,6 +69,22 @@ public class CourseApi {
         return sysThreeCatalogs;
     }
 
+
+    @PostMapping("selectThreeCatalogListByTwoIdList")
+    @ApiOperation("根据二级目录IDList查寻所有三级目录信息")
+    @AnonymousAccess
+    public List<SysThreeCatalog> selectThreeCatalogListByTwoIdList(@RequestBody List<String> twoIds, @RequestParam String schoolId) {
+        SysThreeCatalogExample example = new SysThreeCatalogExample();
+        ArrayList<String> list = new ArrayList<>();
+        list.add(schoolId);
+        list.add(Constant.ADMIN);
+        example.createCriteria().andTwoIdIn(twoIds).andCreatorIn(list);
+        example.setOrderByClause("sort asc");
+        List<SysThreeCatalog> sysThreeCatalogs = threeCatalogMapper.selectByExample(example);
+        return sysThreeCatalogs;
+    }
+
+
     //增加二级目录 SysTwoCatalog systemOwner
     @AnonymousAccess
     @ApiOperation("添加二级目录")
@@ -248,6 +264,15 @@ public class CourseApi {
         return threeCatalogMapper.selectByPrimaryKey(chapterId);
     }
 
+    @AnonymousAccess
+    @ApiOperation("根据章节ID集合查询List")
+    @PostMapping("selectChapterByIdList")
+    public List<SysThreeCatalog> selectChapterByIdList(@RequestBody List<String> chapterIds) {
+        SysThreeCatalogExample example =new SysThreeCatalogExample();
+        example.createCriteria().andThreeIdIn(chapterIds);
+        return threeCatalogMapper.selectByExample(example);
+    }
+
 
     /**
      * 查询章节名称集合
diff --git a/src/main/java/com/sztzjy/resource_center/mapper/SysCaseQuestionStepMapper.java b/src/main/java/com/sztzjy/resource_center/mapper/SysCaseQuestionStepMapper.java
index 85cf3f6..faab779 100644
--- a/src/main/java/com/sztzjy/resource_center/mapper/SysCaseQuestionStepMapper.java
+++ b/src/main/java/com/sztzjy/resource_center/mapper/SysCaseQuestionStepMapper.java
@@ -50,5 +50,5 @@ public interface SysCaseQuestionStepMapper {
     List<SysCaseQuestionStepWithBLOBs> getCaseStepByIds(@Param("ids") List<String> ids);
 
     List<SysCaseQuestionStepWithBLOBs> selectCaseStepListBatchByIdListAndSort(@Param("threeId") String threeId);
-    List<SysCaseQuestionStepWithBLOBs> selectCaseStepListBatchByIdList(@Param("list") List<String> list);
+    List<SysCaseQuestionStepWithBLOBs> selectCaseStepByThreeIds(@Param("list") List<String> list);
 }
\ No newline at end of file
diff --git a/src/main/resources/mapper/SysCaseQuestionStepMapper.xml b/src/main/resources/mapper/SysCaseQuestionStepMapper.xml
index 078c693..f7fea62 100644
--- a/src/main/resources/mapper/SysCaseQuestionStepMapper.xml
+++ b/src/main/resources/mapper/SysCaseQuestionStepMapper.xml
@@ -445,7 +445,7 @@
         </foreach>
     </select>
 
-    <select id="selectCaseStepListBatchByIdList" resultMap="ResultMapWithBLOBs">
+    <select id="selectCaseStepByThreeIds" resultMap="ResultMapWithBLOBs">
         SELECT st.three_id,sc.*
         from sys_case_question_steps sc
                  left join sys_case_questions s