diff --git a/backend/services/admin_service.py b/backend/services/admin_service.py
index c9ce11b..8134ea4 100644
--- a/backend/services/admin_service.py
+++ b/backend/services/admin_service.py
@@ -72,62 +72,81 @@ class AdminService:
         operator_id: int,
         initial_points: int = 60
     ) -> Dict[str, Any]:
-        """批量导入学生"""
+        """批量导入学生（优化版：预查重 + 批量操作）"""
         results = []
         success_count = 0
         
+        # 预查重：一次性获取所有已存在的学号和手机号
+        existing_students = await StudentModel.get_all()
+        existing_student_nos = {s["student_no"] for s in existing_students}
+        
+        all_users = await execute_query("SELECT username FROM users WHERE status = 1")
+        existing_usernames = {u["username"] for u in all_users}
+        
         for student in students:
-            student_no = student.get("student_no", "").strip()
-            name = student.get("name", "").strip()
-            parent_phone = student.get("parent_phone", "").strip()
-            password = student.get("password", "").strip()
-            
-            if not student_no or not name:
-                results.append({"student_no": student_no, "success": False, "error": "学号或姓名不能为空"})
-                continue
-            
-            if not security.validate_student_no(student_no):
-                results.append({"student_no": student_no, "success": False, "error": "学号格式错误"})
-                continue
-            
-            if parent_phone and not security.validate_phone(parent_phone):
-                results.append({"student_no": student_no, "success": False, "error": "手机号格式错误"})
-                continue
-            
-            existing = await StudentModel.get_by_student_no(student_no)
-            if existing:
-                results.append({"student_no": student_no, "success": False, "error": "学号已存在"})
-                continue
-            
-            init_password = password if password else "123456"
-            
-            student_id = await StudentModel.create(
-                student_no=student_no,
-                name=name,
-                parent_phone=parent_phone if parent_phone else None,
-                initial_points=initial_points
-            )
-            
-            await UserModel.create_student(
-                username=student_no,
-                password=init_password,
-                real_name=name,
-                student_id=student_id
-            )
-            
-            if parent_phone:
-                parent_exists = await UserModel.get_by_username(parent_phone)
-                if not parent_exists:
+            try:
+                student_no = student.get("student_no", "").strip()
+                name = student.get("name", "").strip()
+                parent_phone = student.get("parent_phone", "").strip()
+                password = student.get("password", "").strip()
+                
+                if not student_no or not name:
+                    results.append({"student_no": student_no, "success": False, "error": "学号或姓名不能为空"})
+                    continue
+                
+                if not security.validate_student_no(student_no):
+                    results.append({"student_no": student_no, "success": False, "error": "学号格式错误"})
+                    continue
+                
+                if parent_phone and not security.validate_phone(parent_phone):
+                    results.append({"student_no": student_no, "success": False, "error": "手机号格式错误"})
+                    continue
+                
+                if student_no in existing_student_nos:
+                    results.append({"student_no": student_no, "success": False, "error": "学号已存在"})
+                    continue
+                
+                init_password = password if password else "123456"
+                
+                # 创建学生记录
+                student_id = await StudentModel.create(
+                    student_no=student_no,
+                    name=name,
+                    parent_phone=parent_phone if parent_phone else None,
+                    initial_points=initial_points
+                )
+                existing_student_nos.add(student_no)
+                
+                # 创建学生登录账号
+                await UserModel.create_student(
+                    username=student_no,
+                    password=init_password,
+                    real_name=name,
+                    student_id=student_id
+                )
+                existing_usernames.add(student_no)
+                
+                # 创建家长账号（如果手机号存在且未被注册）
+                if parent_phone and parent_phone not in existing_usernames:
                     await UserModel.create_parent(
                         username=parent_phone,
                         password=init_password,
                         real_name=f"{name}家长",
                         student_id=student_id
                     )
+                    existing_usernames.add(parent_phone)
+                
+                results.append({"student_no": student_no, "success": True, "student_id": student_id})
+                success_count += 1
+                logger.info(f"用户[{operator_id}] 导入学生: {student_no} - {name}")
             
-            results.append({"student_no": student_no, "success": True, "student_id": student_id})
-            success_count += 1
-            logger.info(f"用户[{operator_id}] 导入学生: {student_no} - {name}")
+            except Exception as e:
+                logger.error(f"导入学生失败: {student.get('student_no', '?')} - {str(e)}")
+                results.append({
+                    "student_no": student.get("student_no", ""),
+                    "success": False,
+                    "error": f"导入异常: {str(e)}"
+                })
         
         return {
             "success": True,
diff --git a/frontend/assets/js/admin.js b/frontend/assets/js/admin.js
index 0c15697..449a55f 100644
--- a/frontend/assets/js/admin.js
+++ b/frontend/assets/js/admin.js
@@ -134,6 +134,18 @@ async function doImport() {
         showToast(result.message);
         closeModal('importModal');
         loadStudents();
+        
+        // 显示详细导入结果
+        if (result.data && result.data.results) {
+            const failedList = result.data.results.filter(r => !r.success);
+            if (failedList.length > 0) {
+                let detail = '失败详情：\n';
+                failedList.forEach(r => {
+                    detail += `${r.student_no || '未知'}: ${r.error}\n`;
+                });
+                alert(detail);
+            }
+        }
     } else {
         showToast(result.message, 'error');
     }