diff --git a/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs b/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs
index afa48f485..636c02fd1 100644
--- a/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs
+++ b/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs
@@ -94,6 +94,8 @@ namespace IRaCIS.Core.Application.Service.ImageAndDoc
 
             var errorPathList = new List<string>();
 
+            var batchId = Guid.NewGuid();
+
             foreach (var item in idPathList)
             {
                 var path = item.Path;
@@ -106,14 +108,18 @@ namespace IRaCIS.Core.Application.Service.ImageAndDoc
 
                     var prefix = path.Substring(1, path.LastIndexOf('/') - 1);
 
-                    var maskPath = path.Contains(".MaskDicom") ? $"{Path.GetFileName(path)}" : $"{Path.GetFileName(path)}.MaskDicom";
+                    //每次都用一个新的名字
+                    var maskFileName = $"{Path.GetFileName(path)}.{batchId}_MaskDicom";
 
-                    //清理缓存的里面的遮盖图，多次遮盖同一张图时，清除缓存很重要
-                    await _oSSService.DeleteFromPrefix(maskPath, true);
+                    if (path.Contains("_MaskDicom"))
+                    {
+                        //清理缓存的里面的遮盖图，多次遮盖同一张图时，清除缓存很重要
+                        await _oSSService.DeleteFromPrefix(path, true);                    //清理缓存的里面的遮盖图，多次遮盖同一张图时，清除缓存很重要
+                    }
+     
+                    await _oSSService.UploadToOSSAsync(outPutStream, prefix, maskFileName, false);
 
-                    await _oSSService.UploadToOSSAsync(outPutStream, prefix, maskPath, false);
-
-                    var newPath = path.Contains(".MaskDicom") ? path : path + ".MaskDicom";
+                    var newPath = $"/{prefix}/{maskFileName}";
 
                     await _dicomInstanceRepository.BatchUpdateNoTrackingAsync(t => t.Id == item.Id, u => new DicomInstance() { Path = newPath, IsMasked = true });
                 }
@@ -160,11 +166,12 @@ namespace IRaCIS.Core.Application.Service.ImageAndDoc
 
             foreach (var item in idPathList)
             {
-                if (item.Path.EndsWith(".MaskDicom"))
+                if (item.Path.EndsWith("_MaskDicom"))
                 {
-                    var newPath = item.Path[..^10];
+                    await _oSSService.DeleteFromPrefix(item.Path, true);
 
-                    //await _oSSService.DeleteFromPrefix(newPath, true);
+                    var length = Guid.Empty.ToString().Length + "_MaskDicom".Length;
+                    var newPath = item.Path[..^length];
 
                     await _dicomInstanceRepository.BatchUpdateNoTrackingAsync(t => t.Id == item.Id, u => new DicomInstance() { Path = newPath, IsMasked = false });
                 }