diff --git a/java/src/main/java/com/hzu/bookingsystem/service/impl/LabRecordServiceImpl.java b/java/src/main/java/com/hzu/bookingsystem/service/impl/LabRecordServiceImpl.java
index 717fbe1..2fb1bfd 100644
--- a/java/src/main/java/com/hzu/bookingsystem/service/impl/LabRecordServiceImpl.java
+++ b/java/src/main/java/com/hzu/bookingsystem/service/impl/LabRecordServiceImpl.java
@@ -17,6 +17,7 @@ public class LabRecordServiceImpl implements LabRecordService{
 
     @Override
     public LabRecordBean add(LabRecordBean labrcecord) {
+        labrcecord.setLrId(null);
         return labrecordRepository.save(labrcecord);
     }
 
diff --git a/java/src/main/java/com/hzu/bookingsystem/service/impl/UserCourseServiceImpl.java b/java/src/main/java/com/hzu/bookingsystem/service/impl/UserCourseServiceImpl.java
index 5f4505b..68178f9 100644
--- a/java/src/main/java/com/hzu/bookingsystem/service/impl/UserCourseServiceImpl.java
+++ b/java/src/main/java/com/hzu/bookingsystem/service/impl/UserCourseServiceImpl.java
@@ -18,6 +18,7 @@ public class UserCourseServiceImpl implements UserCourseService{
 
     @Override
     public UserCourseBean add(UserCourseBean usercourse) {
+        usercourse.setUcId( null );
         return usercourseRepository.save(usercourse);
     }