diff --git a/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs b/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs
index 1d77f2666..362497a18 100644
--- a/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs
+++ b/IRaCIS.Core.API/Controllers/UploadDownLoadController.cs
@@ -903,7 +903,7 @@ namespace IRaCIS.Core.API.Controllers
             Response.Headers["Cache-Control"] = "no-store";
 
             // ⚠️ 关键：直接用 Response.Body
-             using var zip = new ZipArchive(Response.Body,ZipArchiveMode.Create,leaveOpen: true);
+             using var zip = new ZipArchive(Response.BodyWriter.AsStream(), ZipArchiveMode.Create,leaveOpen: true);
 
             // 本地大文件路径
             var files = new[]