diff --git a/par-core/src/main/java/com/par/core/storage/QiniuStorageService.java b/par-core/src/main/java/com/par/core/storage/QiniuStorageService.java
index 0e2fa36..cd9fa8f 100644
--- a/par-core/src/main/java/com/par/core/storage/QiniuStorageService.java
+++ b/par-core/src/main/java/com/par/core/storage/QiniuStorageService.java
@@ -3,7 +3,6 @@ package com.par.core.storage;
 import com.qiniu.common.QiniuException;
 import com.qiniu.storage.BucketManager;
 import com.qiniu.storage.Configuration;
-import com.qiniu.storage.DownloadUrl;
 import com.qiniu.storage.Region;
 import com.qiniu.storage.UploadManager;
 import com.qiniu.util.Auth;
@@ -93,11 +92,10 @@ public class QiniuStorageService implements StorageService {
             log.warn("Qiniu stat 失败 {}: {}", path, e.response != null ? e.response.error : e.getMessage());
         }
 
-        // 用 DownloadUrl 生成带签名的下载链接
-        long deadline = System.currentTimeMillis() / 1000 + 3600;
+        // 手动拼接 URL + privateDownloadUrl 签名
+        String baseUrl = "http://" + downloadDomain + "/" + path;
+        String signedUrl = auth.privateDownloadUrl(baseUrl, 3600);
         try {
-            DownloadUrl url = new DownloadUrl(downloadDomain, useHttps, path);
-            String signedUrl = url.buildURL(auth, deadline);
             var req = HttpRequest.newBuilder().uri(URI.create(signedUrl))
                     .timeout(Duration.ofSeconds(10)).GET().build();
             var resp = httpClient.send(req, HttpResponse.BodyHandlers.ofString());