diff --git a/IRaCIS.Core.Application/Service/Visit/PatientService.cs b/IRaCIS.Core.Application/Service/Visit/PatientService.cs
index 1d1319171..6acd04e72 100644
--- a/IRaCIS.Core.Application/Service/Visit/PatientService.cs
+++ b/IRaCIS.Core.Application/Service/Visit/PatientService.cs
@@ -3159,7 +3159,8 @@ namespace IRaCIS.Application.Services
 
                 };
 
-                var latestInstanceList = await _scpInstanceRepository.Where(t => inCommand.StudyInstanceUIDList.Contains(t.StudyInstanceUid)).OrderByDescending(t => t.CreateTime).ToListAsync();
+                var latestInstanceList = await _scpInstanceRepository.Where(t => inCommand.StudyInstanceUIDList.Contains(t.StudyInstanceUid))
+                    .GroupBy(t => t.StudyInstanceUid).Select(g => g.OrderByDescending(t => t.CreateTime).FirstOrDefault()).ToListAsync();
 
                 var task = Task.Run(async () =>
                   {