diff --git a/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs b/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
index c02a1f56..7d5308ac 100644
--- a/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
+++ b/Admin.NET/Admin.NET.Core/Service/File/SysFileService.cs
@@ -6,6 +6,7 @@
 
 using Aliyun.OSS.Util;
 using OnceMi.AspNetCore.OSS;
+using System.IO;
 
 namespace Admin.NET.Core.Service;
 
@@ -147,28 +148,20 @@ public class SysFileService : IDynamicApiController, ITransient
     public async Task<IActionResult> GetPreview([FromRoute] long Id)
     {
         var file = await GetFile(new FileInput { Id = Id });
-        //var fileName = HttpUtility.UrlEncode(file.FileName, Encoding.GetEncoding("UTF-8"));
+        var contextType = GetContextType(file.Suffix);
 
         if (_OSSProviderOptions.IsEnable)
         {
             var filePath = string.Concat(file.FilePath, "/", file.Id.ToString() + file.Suffix);
-            var stream = await (await _OSSService.PresignedGetObjectAsync(file.BucketName.ToString(), filePath, 5)).GetAsStreamAsync();
-            return new FileStreamResult(stream.Stream, "application/octet-stream");
-        }
-        else if (App.Configuration["SSHProvider:IsEnable"].ToBoolean())
-        {
-            var fullPath = string.Concat(file.FilePath, "/", file.Id + file.Suffix);
-            using (SSHHelper helper = new SSHHelper(App.Configuration["SSHProvider:Host"],
-               App.Configuration["SSHProvider:Port"].ToInt(), App.Configuration["SSHProvider:Username"], App.Configuration["SSHProvider:Password"]))
-            {
-                return new FileStreamResult(helper.OpenRead(fullPath), "application/octet-stream");
-            }
+            var (stream, encoding, response) = await (await _OSSService.PresignedGetObjectAsync(file.BucketName.ToString(), filePath, 5)).GetAsStreamAsync();            
+            return new FileDownHelper().File(stream, contextType);
         }
         else
         {
             var filePath = Path.Combine(file.FilePath, file.Id.ToString() + file.Suffix);
             var path = Path.Combine(App.WebHostEnvironment.WebRootPath, filePath);
-            return new FileStreamResult(new FileStream(path, FileMode.Open), "application/octet-stream");
+            var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 4096, useAsync: true);
+            return new FileDownHelper().File(stream, contextType);
         }
     }
 
@@ -413,23 +406,12 @@ public class SysFileService : IDynamicApiController, ITransient
             var host = CommonUtil.GetLocalhost();
             if (!host.EndsWith('/'))
                 host += "/";
-            newFile.Url = $"{host}{newFile.FilePath}/{newFile.Id + newFile.Suffix}";
+            newFile.Url = $"/sysFile/preview/{newFile.Id}";
         }
         await _sysFileRep.AsInsertable(newFile).ExecuteCommandAsync();
         return newFile;
     }
 
-    ///// <summary>
-    ///// 获取Minio文件的下载或者预览地址
-    ///// </summary>
-    ///// <param name="bucketName">桶名</param>
-    ///// <param name="fileName">文件名</param>
-    ///// <returns></returns>
-    //private async Task<string> GetMinioPreviewFileUrl(string bucketName, string fileName)
-    //{
-    //    return await _OSSService.PresignedGetObjectAsync(bucketName, fileName, 7);
-    //}
-
     /// <summary>
     /// 上传头像 🔖
     /// </summary>
@@ -527,4 +509,42 @@ public class SysFileService : IDynamicApiController, ITransient
             })
            .ToListAsync();
     }
-}
\ No newline at end of file
+
+    /// <summary>
+    /// 根据扩展名返回 ContextType
+    /// </summary>
+    /// <param name="ext"></param>
+    /// <returns></returns>
+    private string GetContextType(string ext)
+    {
+        return ext switch
+        {
+            ".js" => "application/x-javascript",
+            ".css" => "text/css",
+            ".asp" => "text/asp",
+            ".htm" or ".html" or ".php" => "text/html",
+            ".cgi" => "text/cgi",
+            ".aspx" => "text/aspx",
+            ".jfif" => "image/jpeg",
+            ".jpg" => "image/jpeg",
+            ".webp" => "image/jpeg",
+            ".jpeg" => "image/jpeg",
+            ".gif" => "image/gif",
+            ".ico" => "image/x-icon",
+            ".png" => "image/png",
+            ".xls" or ".xlsx" or ".apk" or ".exe" or ".zip" or ".rar" or ".doc" or ".docx" => "application/x-download",
+            ".pdf" => "application/pdf",
+            ".json" => "application/json",
+            ".swf" => "application/x-shockwave-flash",
+            ".rss" => "application/rss+xml; charset=ISO-8859-1",
+            ".xml" => "text/xml",
+            //除了以上类型，都允许下载                     
+            _ => "application/octet-stream",
+        };
+    }
+}
+
+//为了使用 ControllBase 中的方法，需要继承自 ControllBase 的对象
+internal class FileDownHelper : ControllerBase
+{
+}