diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
index 2b532ede4..3eb6fc091 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
@@ -2804,15 +2804,12 @@ namespace IRaCIS.Application.Services
                 }
 
                 var taskList = subjectTaskList.FirstOrDefault()!.UnReadCanReadTaskList;
-                var count = taskList.Count();
-                Random random = new Random();
-                var skipcount = 0;
-                if (count >= 2)
-                {
-                    skipcount = random.Next(0, count - 1);
-                }
 
-                var visitTaskId = taskList.Skip(skipcount).FirstOrDefault();
+                Random random = new Random();
+                //返回的范围是 0- taskList.Count-1
+                int randomIndex = random.Next(taskList.Count);
+             
+                var visitTaskId = taskList[randomIndex].Id;
 
 				task = await _visitTaskRepository.Where(x=>x.Id== visitTaskId).Select(x => new GetReadingTaskDto()
 				{
@@ -2825,7 +2822,7 @@ namespace IRaCIS.Application.Services
 					SubjectId = x.SubjectId,
 					SubjectCode = x.Subject.Code,
 					TrialReadingCriterionId = x.TrialReadingCriterionId,
-				}).FirstOrDefault();
+				}).FirstOrDefaultAsync();
 
 			}
             else