diff --git a/server/like-front/src/main/java/com/mdd/front/service/impl/StudentServiceImpl.java b/server/like-front/src/main/java/com/mdd/front/service/impl/StudentServiceImpl.java
index 3cb4d1cf..ef4e3689 100644
--- a/server/like-front/src/main/java/com/mdd/front/service/impl/StudentServiceImpl.java
+++ b/server/like-front/src/main/java/com/mdd/front/service/impl/StudentServiceImpl.java
@@ -13,6 +13,7 @@ import org.springframework.beans.BeanUtils;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.Resource;
+import java.util.Date;
 
 @Service
 public class StudentServiceImpl extends ServiceImpl<StudentInfoMapper, StudentInfo> implements IStudentInfoService {
@@ -38,8 +39,13 @@ public class StudentServiceImpl extends ServiceImpl<StudentInfoMapper, StudentIn
             Long studentId = baseInfo.getStudentId();
             Long studentBaseId = baseInfo.getStudentBaseId();
 
+            StudentInfo existingStudentInfo = studentInfoMapper.selectById(studentId);
+            Date preservedPreRegistrationTime = existingStudentInfo != null ? existingStudentInfo.getPreRegistrationTime() : null;
+
             studentInfo.setStudentId(studentId);
             studentBaseInfo.setStudentBaseId(studentBaseId);
+            // 保留原有预报名时间，若之前未设置则用当前时间
+            studentInfo.setPreRegistrationTime(preservedPreRegistrationTime != null ? preservedPreRegistrationTime : new Date());
 
             studentInfoMapper.updateById(studentInfo);
             studentBaseInfoMapper.updateById(studentBaseInfo);
@@ -48,6 +54,8 @@ public class StudentServiceImpl extends ServiceImpl<StudentInfoMapper, StudentIn
         else {
             // 学生学业信息入库
             BeanUtils.copyProperties(studentInfoValidate, studentInfo);
+            // 预报名时间：新增时设置为当前时间
+            studentInfo.setPreRegistrationTime(new Date());
             studentInfoMapper.insert(studentInfo);
 
             // 学生基本信息入库