diff --git a/reading-platform-java/src/main/java/com/reading/platform/service/impl/CourseServiceImpl.java b/reading-platform-java/src/main/java/com/reading/platform/service/impl/CourseServiceImpl.java
index 43d242f..162d8c1 100644
--- a/reading-platform-java/src/main/java/com/reading/platform/service/impl/CourseServiceImpl.java
+++ b/reading-platform-java/src/main/java/com/reading/platform/service/impl/CourseServiceImpl.java
@@ -63,24 +63,24 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
         course.setIntroMethods(request.getIntroMethods());
         course.setIntroEvaluation(request.getIntroEvaluation());
         course.setIntroNotes(request.getIntroNotes());
-        course.setScheduleRefData(request.getScheduleRefData());
+        course.setScheduleRefData(nullIfEmptyJson(request.getScheduleRefData()));
         course.setEnvironmentConstruction(request.getEnvironmentConstruction());
         course.setThemeId(request.getThemeId());
         course.setPictureBookName(request.getPictureBookName());
-        course.setEbookPaths(request.getEbookPaths());
-        course.setAudioPaths(request.getAudioPaths());
-        course.setVideoPaths(request.getVideoPaths());
-        course.setOtherResources(request.getOtherResources());
+        course.setEbookPaths(nullIfEmptyJson(request.getEbookPaths()));
+        course.setAudioPaths(nullIfEmptyJson(request.getAudioPaths()));
+        course.setVideoPaths(nullIfEmptyJson(request.getVideoPaths()));
+        course.setOtherResources(nullIfEmptyJson(request.getOtherResources()));
         course.setPptPath(request.getPptPath());
         course.setPptName(request.getPptName());
         course.setPosterPaths(request.getPosterPaths());
         course.setTools(request.getTools());
         course.setStudentMaterials(request.getStudentMaterials());
-        course.setLessonPlanData(request.getLessonPlanData());
-        course.setActivitiesData(request.getActivitiesData());
-        course.setAssessmentData(request.getAssessmentData());
-        course.setGradeTags(request.getGradeTags());
-        course.setDomainTags(request.getDomainTags());
+        course.setLessonPlanData(nullIfEmptyJson(request.getLessonPlanData()));
+        course.setActivitiesData(nullIfEmptyJson(request.getActivitiesData()));
+        course.setAssessmentData(nullIfEmptyJson(request.getAssessmentData()));
+        course.setGradeTags(nullIfEmptyJson(request.getGradeTags()));
+        course.setDomainTags(nullIfEmptyJson(request.getDomainTags()));
         course.setHasCollectiveLesson(request.getHasCollectiveLesson() != null && request.getHasCollectiveLesson() ? 1 : 0);
 
         course.setVersion("1.0");
@@ -124,24 +124,24 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
         course.setIntroMethods(request.getIntroMethods());
         course.setIntroEvaluation(request.getIntroEvaluation());
         course.setIntroNotes(request.getIntroNotes());
-        course.setScheduleRefData(request.getScheduleRefData());
+        course.setScheduleRefData(nullIfEmptyJson(request.getScheduleRefData()));
         course.setEnvironmentConstruction(request.getEnvironmentConstruction());
         course.setThemeId(request.getThemeId());
         course.setPictureBookName(request.getPictureBookName());
-        course.setEbookPaths(request.getEbookPaths());
-        course.setAudioPaths(request.getAudioPaths());
-        course.setVideoPaths(request.getVideoPaths());
-        course.setOtherResources(request.getOtherResources());
+        course.setEbookPaths(nullIfEmptyJson(request.getEbookPaths()));
+        course.setAudioPaths(nullIfEmptyJson(request.getAudioPaths()));
+        course.setVideoPaths(nullIfEmptyJson(request.getVideoPaths()));
+        course.setOtherResources(nullIfEmptyJson(request.getOtherResources()));
         course.setPptPath(request.getPptPath());
         course.setPptName(request.getPptName());
         course.setPosterPaths(request.getPosterPaths());
         course.setTools(request.getTools());
         course.setStudentMaterials(request.getStudentMaterials());
-        course.setLessonPlanData(request.getLessonPlanData());
-        course.setActivitiesData(request.getActivitiesData());
-        course.setAssessmentData(request.getAssessmentData());
-        course.setGradeTags(request.getGradeTags());
-        course.setDomainTags(request.getDomainTags());
+        course.setLessonPlanData(nullIfEmptyJson(request.getLessonPlanData()));
+        course.setActivitiesData(nullIfEmptyJson(request.getActivitiesData()));
+        course.setAssessmentData(nullIfEmptyJson(request.getAssessmentData()));
+        course.setGradeTags(nullIfEmptyJson(request.getGradeTags()));
+        course.setDomainTags(nullIfEmptyJson(request.getDomainTags()));
         course.setHasCollectiveLesson(request.getHasCollectiveLesson() != null && request.getHasCollectiveLesson() ? 1 : 0);
 
         course.setVersion("1.0");
@@ -224,7 +224,7 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
             course.setIntroNotes(request.getIntroNotes());
         }
         if (request.getScheduleRefData() != null) {
-            course.setScheduleRefData(request.getScheduleRefData());
+            course.setScheduleRefData(nullIfEmptyJson(request.getScheduleRefData()));
         }
         if (request.getEnvironmentConstruction() != null) {
             course.setEnvironmentConstruction(request.getEnvironmentConstruction());
@@ -236,16 +236,16 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
             course.setPictureBookName(request.getPictureBookName());
         }
         if (request.getEbookPaths() != null) {
-            course.setEbookPaths(request.getEbookPaths());
+            course.setEbookPaths(nullIfEmptyJson(request.getEbookPaths()));
         }
         if (request.getAudioPaths() != null) {
-            course.setAudioPaths(request.getAudioPaths());
+            course.setAudioPaths(nullIfEmptyJson(request.getAudioPaths()));
         }
         if (request.getVideoPaths() != null) {
-            course.setVideoPaths(request.getVideoPaths());
+            course.setVideoPaths(nullIfEmptyJson(request.getVideoPaths()));
         }
         if (request.getOtherResources() != null) {
-            course.setOtherResources(request.getOtherResources());
+            course.setOtherResources(nullIfEmptyJson(request.getOtherResources()));
         }
         if (request.getPptPath() != null) {
             course.setPptPath(request.getPptPath());
@@ -263,19 +263,19 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
             course.setStudentMaterials(request.getStudentMaterials());
         }
         if (request.getLessonPlanData() != null) {
-            course.setLessonPlanData(request.getLessonPlanData());
+            course.setLessonPlanData(nullIfEmptyJson(request.getLessonPlanData()));
         }
         if (request.getActivitiesData() != null) {
-            course.setActivitiesData(request.getActivitiesData());
+            course.setActivitiesData(nullIfEmptyJson(request.getActivitiesData()));
         }
         if (request.getAssessmentData() != null) {
-            course.setAssessmentData(request.getAssessmentData());
+            course.setAssessmentData(nullIfEmptyJson(request.getAssessmentData()));
         }
         if (request.getGradeTags() != null) {
-            course.setGradeTags(request.getGradeTags());
+            course.setGradeTags(nullIfEmptyJson(request.getGradeTags()));
         }
         if (request.getDomainTags() != null) {
-            course.setDomainTags(request.getDomainTags());
+            course.setDomainTags(nullIfEmptyJson(request.getDomainTags()));
         }
         if (request.getHasCollectiveLesson() != null) {
             course.setHasCollectiveLesson(request.getHasCollectiveLesson() ? 1 : 0);
@@ -442,4 +442,11 @@ public class CourseServiceImpl extends ServiceImpl<CourseMapper, Course>
         );
     }
 
+    /**
+     * 将空字符串转为 null，避免 MySQL JSON 列报错（空串不是有效 JSON）
+     */
+    private static String nullIfEmptyJson(String s) {
+        return (s != null && !s.isBlank()) ? s : null;
+    }
+
 }