diff --git a/src/main/java/com/yunhai/bschclassmanage/service/impl/SchBinSchsystemService.java b/src/main/java/com/yunhai/bschclassmanage/service/impl/SchBinSchsystemService.java
index de3373c..77ef939 100644
--- a/src/main/java/com/yunhai/bschclassmanage/service/impl/SchBinSchsystemService.java
+++ b/src/main/java/com/yunhai/bschclassmanage/service/impl/SchBinSchsystemService.java
@@ -279,7 +279,7 @@ public class SchBinSchsystemService implements ISchBinSchsystemService {
         for (Integer schsystemId:schsystemIds)
         {
             stuParentId=schsystemIdByAcademicStage.get(schsystemId);
-            Set<Integer> years= baseSchsystemGradeService.getNowYearGradeMap(schId,schsystemId).keySet();
+            List<Integer> years= new ArrayList<>(baseSchsystemGradeService.getNowYearGradeMap(schId,schsystemId).values());
             for (Integer year:years){
                 sendUserBaseService.addGroup(year.toString(),stuParentId,schsystemId,NodeType.GRADE,schId);
             }