diff --git a/server/like-admin/src/main/java/com/mdd/admin/service/impl/TeacherServiceImpl.java b/server/like-admin/src/main/java/com/mdd/admin/service/impl/TeacherServiceImpl.java
index 1df1b077..c8359576 100644
--- a/server/like-admin/src/main/java/com/mdd/admin/service/impl/TeacherServiceImpl.java
+++ b/server/like-admin/src/main/java/com/mdd/admin/service/impl/TeacherServiceImpl.java
@@ -26,13 +26,7 @@ import com.mdd.common.mapper.admin.AdminMapper;
 import com.mdd.common.mapper.system.SystemRoleMapper;
 import com.mdd.common.exception.OperateException;
 import com.mdd.common.service.RegisterService;
-import com.mdd.common.util.ConfigUtils;
-import com.mdd.common.util.QrCodeUtil;
-import com.mdd.common.util.RandomUtil;
-import com.mdd.common.util.TimeUtils;
-import com.mdd.common.util.ToolUtils;
-import com.mdd.common.util.UrlUtils;
-import com.mdd.common.util.YmlUtils;
+import com.mdd.common.util.*;
 import com.google.zxing.WriterException;
 
 import java.io.File;
@@ -393,6 +387,9 @@ public class TeacherServiceImpl implements ITeacherService {
         // 生成二维码内容URL（预报名页面地址）
         String qrCodeContent = buildQrCodeUrl(invitationCode);
 
+        // 删除旧的二维码文件（如果存在）
+        deleteOldQrCodeFile(teacher.getQrcodeUrl());
+
         // 生成二维码图片并保存
         String qrcodeUrl = generateAndSaveQrCode(invitationCode, qrCodeContent, teacherId);
 
@@ -480,13 +477,8 @@ public class TeacherServiceImpl implements ITeacherService {
 
             if ("local".equals(engine)) {
                 // ========== 方案B：本地存储 ==========
-                String directory = YmlUtils.get("like.upload-directory");
-                if (directory == null || directory.isEmpty()) {
-                    throw new OperateException("请配置上传目录like.upload-directory");
-                }
-
                 String folder = "qrcode/teacher";
-                String savePath = (directory + folder + "/" + date).replace("\\", "/");
+                String savePath = (folder + "/" + date).replace("\\", "/");
                 File saveDir = new File(savePath);
                 if (!saveDir.exists()) {
                     if (!saveDir.mkdirs()) {
@@ -594,13 +586,8 @@ public class TeacherServiceImpl implements ITeacherService {
         if (!"local".equals(engine)) {
             return null;
         }
-        String directory = YmlUtils.get("like.upload-directory");
-        if (directory == null || directory.isEmpty()) {
-            return null;
-        }
-        String path = teacher.getQrcodeUrl().startsWith("/") ? teacher.getQrcodeUrl() : "/" + teacher.getQrcodeUrl();
-        String fullPath = (directory + path).replace("\\", "/");
-        java.io.File file = new java.io.File(fullPath);
+        String path = teacher.getQrcodeUrl().startsWith("/") ? teacher.getQrcodeUrl().substring(1) : teacher.getQrcodeUrl();
+        java.io.File file = new java.io.File(path);
         if (!file.exists() || !file.isFile()) {
             return null;
         }
@@ -610,4 +597,26 @@ public class TeacherServiceImpl implements ITeacherService {
             return null;
         }
     }
+
+    /**
+     * 删除旧的二维码文件
+     *
+     * @param oldQrcodeUrl 旧的二维码相对路径
+     */
+    private void deleteOldQrCodeFile(String oldQrcodeUrl) {
+        if (StringUtils.isBlank(oldQrcodeUrl)) {
+            return;
+        }
+        try {
+            String path = oldQrcodeUrl.startsWith("/") ? oldQrcodeUrl.substring(1) : oldQrcodeUrl;
+            File oldFile = new File(path);
+            if (oldFile.exists() && oldFile.isFile()) {
+                if (!oldFile.delete()) {
+                    System.err.println("删除旧二维码文件失败: " + path);
+                }
+            }
+        } catch (Exception e) {
+            System.err.println("删除旧二维码文件时发生异常: " + e.getMessage());
+        }
+    }
 }