diff --git a/dl_admin/ruoyi-admin/src/main/java/com/ruoyi/utils/OssUtil.java b/dl_admin/ruoyi-admin/src/main/java/com/ruoyi/utils/OssUtil.java
index c27b156..0b845f0 100644
--- a/dl_admin/ruoyi-admin/src/main/java/com/ruoyi/utils/OssUtil.java
+++ b/dl_admin/ruoyi-admin/src/main/java/com/ruoyi/utils/OssUtil.java
@@ -3,6 +3,7 @@ package com.ruoyi.utils;
 import com.aliyun.oss.ClientBuilderConfiguration;
 import com.aliyun.oss.OSS;
 import com.aliyun.oss.OSSClientBuilder;
+import com.aliyun.oss.model.ObjectMetadata;
 import com.aliyuncs.utils.IOUtils;
 import com.ruoyi.common.config.OssConfig;
 import lombok.extern.slf4j.Slf4j;
@@ -51,8 +52,13 @@ public class OssUtil {
         ClientBuilderConfiguration conf = new ClientBuilderConfiguration();
         OSS client = new OSSClientBuilder().build(ossConfig.getEndPoint(), ossConfig.getAccessKeyId(), ossConfig.getAccessKeySecret(), conf);
         try {
+            // 在获取文件流之前，先获取文件元数据
+            ObjectMetadata metadata = client.getObjectMetadata(ossConfig.getBucketName(), fileKey);
+            long contentLength = metadata.getContentLength();
             stream = client.getObject(ossConfig.getBucketName(), fileKey).getObjectContent();
             response.reset();
+            // 设置Content-Length响应头
+            response.setContentLengthLong(contentLength);
             response.setContentType("application/octet-stream");
             response.addHeader("Content-Disposition", "attachment;filename=CDbay-" + URLEncoder.encode(fileName, "UTF-8")
                     .replace("+", "%20")+".apk");