diff --git a/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs b/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs
index 1fb2624d..6131b52a 100644
--- a/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs
+++ b/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs
@@ -1019,7 +1019,7 @@ public class Ghre_ExamRecordServices : BaseServices<Ghre_ExamRecord, Ghre_ExamRe
         var studyRecord = await Db.Queryable<Ghre_StudyRecord>().FirstAsync(x => x.Id == record.StudyRecordId);
         if (exam.DateType == DicExamDateType.AFTER_HOW_LONG)
         {
-            record.BeginTime = studyRecord?.EndTime;
+            record.BeginTime = studyRecord?.EndTime ?? DateTime.Now;
             if (!record.BeginTime.IsNull())
                 record.EndTime = record.BeginTime.Value.AddDays(exam.AfterHowLong ?? 7);
         }