diff --git a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/LessonInfo/LessonInfoService.cs b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/LessonInfo/LessonInfoService.cs
index 9352f2da1..9d62cd91e 100644
--- a/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/LessonInfo/LessonInfoService.cs	
+++ b/Learun.Framework.Ultimate V7/Learun.Framework.Module/Learun.Application.Module/Learun.Application.TwoDevelopment/EducationalAdministration/LessonInfo/LessonInfoService.cs	
@@ -276,7 +276,28 @@ namespace Learun.Application.TwoDevelopment.EducationalAdministration
                 if (!string.IsNullOrEmpty(keyValue))
                 {
                     entity.Modify(keyValue);
+                    var strSql = "";
+                    if (entity.WeekPracticeHour.ToString() == "")
+                    {
+                        strSql += " update LessonInfo set WeekPracticeHour = null where LessonId ='" + keyValue + "' ;";
+                    }
+                    if (entity.TotalStudyHour.ToString() == "")
+                    {
+                        strSql += " update LessonInfo set TotalStudyHour = null where LessonId ='" + keyValue + "' ;";
+                    }
+                    if (entity.StudyScore.ToString() == "")
+                    {
+                        strSql += " update LessonInfo set StudyScore = null where LessonId ='" + keyValue + "' ;";
+                    }
+                    if (entity.WeekStudyHour.ToString() == "")
+                    {
+                        strSql += " update LessonInfo set WeekStudyHour = null where LessonId ='" + keyValue + "' ;";
+                    }
                     this.BaseRepository("CollegeMIS").Update(entity);
+                    if (!string.IsNullOrEmpty(strSql))
+                    {
+                        BaseRepository("CollegeMIS").ExecuteBySql(strSql);
+                    }
                 }
                 else
                 {