diff --git a/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs b/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs
index 609b2efce..bb7517717 100644
--- a/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs
+++ b/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs
@@ -1091,7 +1091,7 @@ namespace IRaCIS.Core.API.Controllers
                                     await using var entryStream = entry.Open();
                                     await using var source = await _oSSService.GetStreamFromOSSAsync(instance.Path);
 
-                                    if (instance.IsEncapsulated)
+                                    if (instance.IsEncapsulated && instance.NumberOfFrames > 1)
                                     {
                                         #region 将多帧合并为一帧-在方法里，占用内存，拆成单独方法，不占用内存
 
@@ -1156,7 +1156,7 @@ namespace IRaCIS.Core.API.Controllers
 
                                         var ok = await TryWriteMergedDicomAsync(
                                                     () => _oSSService.GetStreamFromOSSAsync(instance.Path),
-                                                    entryStream       
+                                                    entryStream
                                                 );
 
                                         if (!ok)
@@ -2105,7 +2105,7 @@ namespace IRaCIS.Core.API.Controllers
                                     await using var source = await _oSSService.GetStreamFromOSSAsync(instance.Path);
 
 
-                                    if (instance.IsEncapsulated)
+                                    if (instance.IsEncapsulated && instance.NumberOfFrames > 1)
                                     {
                                         #region 将多帧合并为一帧-在方法里，占用内存，拆成单独方法，不占用内存
 
diff --git a/IRaCIS.Core.Application/Service/Visit/DTO/PatientViewModel.cs b/IRaCIS.Core.Application/Service/Visit/DTO/PatientViewModel.cs
index bc9d7c9f7..deabeb9e8 100644
--- a/IRaCIS.Core.Application/Service/Visit/DTO/PatientViewModel.cs
+++ b/IRaCIS.Core.Application/Service/Visit/DTO/PatientViewModel.cs
@@ -1274,6 +1274,7 @@ namespace IRaCIS.Application.Contracts
 
     public class DownloadDicomInstanceDto
     {
+        public int NumberOfFrames { get; set; }
         public bool IsEncapsulated { get; set; }
         public Guid InstanceId { get; set; }
         public string FileName { get; set; }
diff --git a/IRaCIS.Core.Application/Service/Visit/PatientService.cs b/IRaCIS.Core.Application/Service/Visit/PatientService.cs
index 3e6d9390a..d83c412fb 100644
--- a/IRaCIS.Core.Application/Service/Visit/PatientService.cs
+++ b/IRaCIS.Core.Application/Service/Visit/PatientService.cs
@@ -3409,6 +3409,7 @@ namespace IRaCIS.Application.Services
 
                         InstanceList = z.SCPInstanceList.Select(k => new DownloadDicomInstanceDto()
                         {
+                            NumberOfFrames = k.NumberOfFrames,
                             IsEncapsulated = k.IsEncapsulated,
                             InstanceId = k.Id,
                             FileName = string.Empty,
@@ -3555,6 +3556,7 @@ namespace IRaCIS.Application.Services
 
                                     InstanceList = z.DicomInstanceList.Select(k => new DownloadDicomInstanceDto()
                                     {
+                                        NumberOfFrames = k.NumberOfFrames,
                                         IsEncapsulated = k.IsEncapsulated,
                                         InstanceId = k.Id,
                                         FileName = string.Empty,