diff --git a/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs b/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs
index 57c666db..f49113f0 100644
--- a/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs
+++ b/Tiobon.Core.Services/Ghre/Ghre_CourseServices.cs
@@ -540,6 +540,13 @@ public class Ghre_CourseServices : BaseServices<Ghre_Course, Ghre_CourseDto, Ins
                 //entity.SchoolId = teacher.SchoolId;
             }
         }
+
+        if (await QueryCompanyCode() == "Ushio")
+        {
+            var courseClass = await Db.Queryable<Ghre_CourseClass>().Where(x => x.Id == entity.CourseClassIds[0]).Select(x => x.ClassNo).FirstAsync();
+            var prefixTemp = courseClass + entity.CourseClass2.Substring(1, entity.CourseClass2.Length - 1);
+            entity.CourseNo = await GenerateContinuousSequence("Ghre_Course", "CourseNo", prefixTemp, prefixTemp.Length + 2, 2);
+        }
         var result = await base.Add(entity);
 
         return result;