diff --git a/backend/wall-server/src/main/java/cn/yiming1234/NottinghamWall/service/impl/StudentServiceImpl.java b/backend/wall-server/src/main/java/cn/yiming1234/NottinghamWall/service/impl/StudentServiceImpl.java
index 734327a2..77ed2bbc 100644
--- a/backend/wall-server/src/main/java/cn/yiming1234/NottinghamWall/service/impl/StudentServiceImpl.java
+++ b/backend/wall-server/src/main/java/cn/yiming1234/NottinghamWall/service/impl/StudentServiceImpl.java
@@ -301,7 +301,8 @@ public Student update(StudentDTO studentDTO) throws Exception {
             }
 
             String currentAvatarName = student.getAvatar();
-            String newAvatarName = studentDTO.getAvatar();
+            String newAvatarName = extractFileName(studentDTO.getAvatar());
+            log.info(newAvatarName);
             if (!currentAvatarName.equals(newAvatarName) && !student.getAvatar().contains("default.jpg")) {
                 aliOssUtil.delete(currentAvatarName);
             }