diff --git a/src/main/java/cn/teammodel/controller/admin/service/impl/TeacherServiceImpl.java b/src/main/java/cn/teammodel/controller/admin/service/impl/TeacherServiceImpl.java
index 4774d95..d5d529c 100644
--- a/src/main/java/cn/teammodel/controller/admin/service/impl/TeacherServiceImpl.java
+++ b/src/main/java/cn/teammodel/controller/admin/service/impl/TeacherServiceImpl.java
@@ -695,7 +695,7 @@ public class TeacherServiceImpl implements TeacherService {
 
                 }
             }
-
+            gradeCount.keySet().removeIf(key -> key.startsWith("20"));
             gradesMap.put("grade", gradeCount);
             degreesMap.put("degree", degreeCount);
             subjectsMap.put("subject", subjectCount);