diff --git a/IRaCIS.Core.Application/Service/ImageAndDoc/SeriesService.cs b/IRaCIS.Core.Application/Service/ImageAndDoc/SeriesService.cs
index 59ecf2f34..e7fbd8947 100644
--- a/IRaCIS.Core.Application/Service/ImageAndDoc/SeriesService.cs
+++ b/IRaCIS.Core.Application/Service/ImageAndDoc/SeriesService.cs
@@ -46,13 +46,23 @@ namespace IRaCIS.Core.Application.Services
                 var instanceList = await _scpInstanceRepository.Where(s => s.StudyId == studyId).IgnoreQueryFilters()
                      .OrderBy(t => t.SeriesId).ThenBy(t => t.InstanceNumber)
                      .ThenBy(s => s.InstanceTime).ThenBy(s => s.CreateTime)
-                    .Select(t => new { t.SeriesId, t.Id, t.Path, t.NumberOfFrames, t.InstanceNumber, t.FileSize }).ToListAsync();//.GroupBy(u => u.SeriesId);
+                    .Select(t => new { t.SeriesId, t.Id, t.Path, t.NumberOfFrames, t.InstanceNumber, t.FileSize, t.ImagePositionPatient, t.ImageOrientationPatient }).ToListAsync();//.GroupBy(u => u.SeriesId);
 
 
                 foreach (var series in seriesList)
                 {
 
-                    series.InstanceInfoList = instanceList.Where(t => t.SeriesId == series.Id).OrderBy(t => t.InstanceNumber).Select(k =>
+                    var instances = instanceList.Where(x => x.SeriesId == series.Id);
+
+                    // ⭐ DICOM 空间排序（带兜底）
+                    var sorted = DicomSortHelper.SortSlices(
+                        instances,
+                        x => x.ImagePositionPatient,
+                        x => x.ImageOrientationPatient,
+                        x => x.InstanceNumber
+                    );
+
+                    series.InstanceInfoList = sorted.Select(k =>
                        new InstanceBasicInfo()
                        {
                            Id = k.Id,
diff --git a/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs b/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs
index 9bf4dbc8a..a4f8a568d 100644
--- a/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs
+++ b/IRaCIS.Core.Application/Service/Visit/SubjectVisitService.cs
@@ -270,7 +270,7 @@ namespace IRaCIS.Core.Application.Services
             var instanceList = await _dicomInstanceRepository.Where(t => studyIds.Contains(t.StudyId)).IgnoreQueryFilters()
                    .WhereIf(isReading == 1, s => s.IsReading && s.IsDeleted == false)
                    .WhereIf(isQCFinished, t => t.IsDeleted == false)
-                   .Select(t => new { t.SeriesId, t.Id, t.InstanceNumber, t.Path, t.NumberOfFrames, t.HtmlPath, t.IsReading, t.IsDeleted, t.FileSize }).ToListAsync();
+                   .Select(t => new { t.SeriesId, t.Id, t.InstanceNumber, t.Path, t.NumberOfFrames, t.HtmlPath, t.IsReading, t.IsDeleted, t.FileSize, t.ImagePositionPatient, t.ImageOrientationPatient }).ToListAsync();
 
             foreach (var t in studyList)
             {
@@ -284,7 +284,17 @@ namespace IRaCIS.Core.Application.Services
                 t.SeriesList.ForEach(series =>
                 {
 
-                    series.InstanceInfoList = instanceList.Where(t => t.SeriesId == series.Id).OrderBy(t => t.InstanceNumber).Select(k =>
+                    var instances = instanceList.Where(x => x.SeriesId == series.Id);
+
+                    // ⭐ DICOM 空间排序（带兜底）
+                    var sorted = DicomSortHelper.SortSlices(
+                        instances,
+                        x => x.ImagePositionPatient,
+                        x => x.ImageOrientationPatient,
+                        x => x.InstanceNumber
+                    );
+
+                    series.InstanceInfoList = sorted.Select(k =>
                     new InstanceBasicInfo()
                     {
                         Id = k.Id,