diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingOncologyTaskService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingOncologyTaskService.cs
index 268ad1b50..89303a64c 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingOncologyTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingOncologyTaskService.cs
@@ -79,7 +79,7 @@ namespace IRaCIS.Application.Services
               x.TrialReadingCriterionId == taskInfo.TrialReadingCriterionId &&
               x.ReadingCategory == ReadingCategory.Global &&
               x.VisitTaskNum < taskInfo.VisitTaskNum
-              ).OrderByDescending(x => x.VisitTaskNum)
+              ).OrderBy(x => x.ArmEnum)
               .FirstNotNullAsync();
             }