diff --git a/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/dto/response/CourseResponse.java b/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/dto/response/CourseResponse.java
index 3264acb..2cd7f88 100644
--- a/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/dto/response/CourseResponse.java
+++ b/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/dto/response/CourseResponse.java
@@ -6,6 +6,10 @@ import lombok.Builder;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
 @Data
 @Builder
 @NoArgsConstructor
@@ -63,6 +67,47 @@ public class CourseResponse {
         courseResponse.setClassroom(course.getClassroom().getRoom());
 
         return courseResponse;
+    }
+
+    /**
+     * 切课，将连着的几节课切开来
+     *
+     * @param courses mywust类型的CourseList
+     * @return List<CourseResponse>
+     */
+    public static List<CourseResponse> convertCourseList(Collection<Course> courses) {
+        List<CourseResponse> courseResponses = new ArrayList<>(courses.size() * 2);
+
+        CourseResponse.CourseResponseBuilder builder = CourseResponse.builder();
+        for (Course course : courses) {
+            builder.className(course.getName());
+            builder.teachClass(course.getTeachClass());
+            builder.classroom(course.getClassroom().getRoom());
+            builder.startWeek(course.getStartWeek());
+            builder.endWeek(course.getEndWeek());
+            builder.weekDay(course.getWeekDay());
+            builder.teacher(course.getTeacher());
+
+            int startSection = course.getStartSection();
+            int endSection = course.getEndSection();
+
+            int courseSize = endSection - startSection + 1;
+
+            // 课程大小大于2的将课程按两节两节分割，只有一节的按两节处理
+            if (courseSize > 2) {
+                for (int i = 0; i < courseSize / 2; i++) {
+                    int splitStartSection = startSection + i * 2;
+                    int section = splitStartSection - (splitStartSection / 2);
+                    builder.section(section);
+
+                    courseResponses.add(builder.build());
+                }
+            } else {
+                builder.section(startSection - (startSection / 2));
+                courseResponses.add(builder.build());
+            }
+        }
 
+        return courseResponses;
     }
 }
diff --git a/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/graduate/GraduateController.java b/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/graduate/GraduateController.java
index fc280b2..0c45e02 100644
--- a/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/graduate/GraduateController.java
+++ b/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/graduate/GraduateController.java
@@ -56,53 +56,11 @@ public class GraduateController {
         var user = TokenTool.getStudentNumber(token);
         var courses = courseTableService.getCourseTable(user);
         LinkedHashSet<Course> filteredCourse = new LinkedHashSet<>(courses);
-        var resultList = convertCourseList(filteredCourse);
+        var resultList = CourseResponse.convertCourseList(filteredCourse);
 
         return Response.success(V2ResponseCode.YJS_GETCOURSE_SUC.getCode(), resultList);
     }
 
-    /**
-     * 切课，将连着的几节课切开来
-     *
-     * @param courses mywust类型的CourseList
-     * @return List<CourseResponse>
-     */
-    private List<CourseResponse> convertCourseList(Collection<Course> courses) {
-        List<CourseResponse> courseResponses = new ArrayList<>(courses.size() * 2);
-
-        CourseResponse.CourseResponseBuilder builder = CourseResponse.builder();
-        for (Course course : courses) {
-            builder.className(course.getName());
-            builder.teachClass(course.getTeachClass());
-            builder.classroom(course.getClassroom().getRoom());
-            builder.startWeek(course.getStartWeek());
-            builder.endWeek(course.getEndWeek());
-            builder.weekDay(course.getWeekDay());
-            builder.teacher(course.getTeacher());
-
-            int startSection = course.getStartSection();
-            int endSection = course.getEndSection();
-
-            int courseSize = endSection - startSection + 1;
-
-            // 课程大小大于2的将课程按两节两节分割，只有一节的按两节处理
-            if (courseSize > 2) {
-                for (int i = 0; i < courseSize / 2; i++) {
-                    int splitStartSection = startSection + i * 2;
-                    int section = splitStartSection - (splitStartSection / 2);
-                    builder.section(section);
-
-                    courseResponses.add(builder.build());
-                }
-            } else {
-                builder.section(startSection - (startSection / 2));
-                courseResponses.add(builder.build());
-            }
-        }
-
-        return courseResponses;
-    }
-
     @RequestMapping("/get-grade")
     public Response<List<GraduateScoreResponse>> getScore(@RequestHeader("Token") String token) {
         var user = TokenTool.getStudentNumber(token);
diff --git a/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/undergrade/UndergradController.java b/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/undergrade/UndergradController.java
index 42f85db..12c5a1c 100644
--- a/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/undergrade/UndergradController.java
+++ b/backend-main/backend-web/src/main/java/wusthelper/web/api/v2/module/undergrade/UndergradController.java
@@ -1,5 +1,6 @@
 package wusthelper.web.api.v2.module.undergrade;
 
+import cn.wustlinghang.mywust.data.global.Course;
 import org.springframework.web.bind.annotation.RequestHeader;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
@@ -13,10 +14,7 @@ import wusthelper.web.api.v2.dto.response.undergrad.StudentInfoResponse;
 import wusthelper.web.response.Response;
 import wusthelper.web.service.campus.undergrad.*;
 
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
+import java.util.*;
 
 @RequireToken
 @RestController
@@ -55,10 +53,8 @@ public class UndergradController {
                                                      @RequestParam(value = "schoolTerm") String term) {
         var user = TokenTool.getStudentNumber(token);
         var courses = courseTableService.getCourseTable(user, term);
-        var resultList = new ArrayList<CourseResponse>(courses.size());
-        for (var course : courses) {
-            resultList.add(CourseResponse.from(course));
-        }
+        var filteredCourse = new LinkedHashSet<>(courses);
+        var resultList = CourseResponse.convertCourseList(filteredCourse);
 
         return Response.success(V2ResponseCode.JWC_GETCURRICULUM_SUC.getCode(), resultList);
     }
diff --git a/backend-main/backend-web/src/main/java/wusthelper/web/service/cookie/CookieManager.java b/backend-main/backend-web/src/main/java/wusthelper/web/service/cookie/CookieManager.java
index 0202ef8..261cd1a 100644
--- a/backend-main/backend-web/src/main/java/wusthelper/web/service/cookie/CookieManager.java
+++ b/backend-main/backend-web/src/main/java/wusthelper/web/service/cookie/CookieManager.java
@@ -88,6 +88,7 @@ public class CookieManager {
     public String refreshCookie(String username, CookieType cookieType) {
         var student = studentMapper.selectOne(new QueryWrapper<UserBasic>()
                 .eq("stu_num", username)
+                .last("limit 1")
                 .eq("deleted", 0)
         );