diff --git a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
index 18cfbca90..ba791cea0 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadingImageTask/ReadingImageTaskService.cs
@@ -2332,9 +2332,22 @@ namespace IRaCIS.Application.Services
             }
             else
             {
-                task = await _visitTaskRepository.Where(x => x.TrialId == inDto.TrialId && x.TrialReadingCriterionId == trialReadingCriterionId && x.ReadingTaskState != ReadingTaskState.HaveSigned && x.DoctorUserId == _userInfo.Id
+                var query = _visitTaskRepository.Where(x => x.TrialId == inDto.TrialId && x.TrialReadingCriterionId == trialReadingCriterionId && x.ReadingTaskState != ReadingTaskState.HaveSigned && x.DoctorUserId == _userInfo.Id
                 && x.TrialReadingCriterionId == trialReadingCriterionId
-                && x.TaskState == TaskState.Effect).Select(x => new GetReadingTaskDto()
+                && x.TaskState == TaskState.Effect);
+                var count = await query.CountAsync();
+                if (count == 0)
+                {
+                    throw new BusinessValidationFailedException(_localizer["ReadingImage_TaskFinish"]);
+                }
+                Random random = new Random();
+                var skipcount = 0;
+                if (count >= 2)
+                {
+                    skipcount = random.Next(0, count - 1);
+                }
+                task = await query
+                    .Select(x => new GetReadingTaskDto()
                 {
                     VisitTaskId = x.Id,
                     ArmEnum = x.ArmEnum,
@@ -2345,7 +2358,7 @@ namespace IRaCIS.Application.Services
                     SubjectId = x.SubjectId,
                     SubjectCode = x.Subject.Code,
                     TrialReadingCriterionId = x.TrialReadingCriterionId,
-                }).FirstOrDefaultAsync();
+                }).Skip(skipcount).FirstOrDefaultAsync();
 
             }