diff --git a/backend-java/src/main/java/com/nanri/aiimage/modules/brand/service/BrandTaskService.java b/backend-java/src/main/java/com/nanri/aiimage/modules/brand/service/BrandTaskService.java
index b6e66238..6ced901c 100644
--- a/backend-java/src/main/java/com/nanri/aiimage/modules/brand/service/BrandTaskService.java
+++ b/backend-java/src/main/java/com/nanri/aiimage/modules/brand/service/BrandTaskService.java
@@ -1065,9 +1065,9 @@ public class BrandTaskService {
         List<CompletableFuture<String>> uploadFutures = new ArrayList<>(entries.size());
         for (OutputEntry entry : entries) {
             uploadFutures.add(CompletableFuture.supplyAsync(() -> {
-                // 存储完整公开地址，下载时会自动通过 resolveObjectKey 提取 objectKey（见 OssStorageService.resolveObjectKey）
+                // 存储完整公开地址：result/ 前缀走 download-endpoint 独立下载域名，下载时可直接使用
                 String objectKey = ossStorageService.uploadResultFile(entry.resultFile(), MODULE_TYPE);
-                return ossStorageService.getPublicUrl(objectKey);
+                return ossStorageService.generateFreshDownloadUrl(objectKey);
             }, resultUploadExecutor));
         }
         for (CompletableFuture<String> future : uploadFutures) {
@@ -1089,7 +1089,7 @@ public class BrandTaskService {
         File zipFile = packageAsZip(taskId, entries);
         String zipObjectKey = ossStorageService.uploadResultFile(zipFile, MODULE_TYPE);
         result.put("zip_object_key", zipObjectKey);
-        result.put("zip_url", ossStorageService.getPublicUrl(zipObjectKey));
+        result.put("zip_url", ossStorageService.generateFreshDownloadUrl(zipObjectKey));
         return result;
     }
 
diff --git a/backend-java/src/main/java/com/nanri/aiimage/modules/collectdata/service/CollectDataService.java b/backend-java/src/main/java/com/nanri/aiimage/modules/collectdata/service/CollectDataService.java
index 4c9496b6..9310d3ce 100644
--- a/backend-java/src/main/java/com/nanri/aiimage/modules/collectdata/service/CollectDataService.java
+++ b/backend-java/src/main/java/com/nanri/aiimage/modules/collectdata/service/CollectDataService.java
@@ -1593,8 +1593,8 @@ public class CollectDataService {
         }
         try {
             // bucket 对 result/ 前缀已开放公开读，使用无签名公开 URL，避免签名 1 小时过期后下载 403。
-            // resolveObjectKey 兼容历史存量的旧格式（带签名的完整 URL），统一还原为纯 objectKey 再拼公开 URL。
-            return ossStorageService.getPublicUrl(ossStorageService.resolveObjectKey(resultFileUrl));
+            // result/ 前缀走 download-endpoint 独立下载域名（带宽/缓存分流），非 result/（如图片）仍走公开端点。
+            return ossStorageService.generateFreshDownloadUrl(resultFileUrl);
         } catch (Exception ex) {
             log.warn("[collect-data] build public download url failed resultId={} err={}",
                     row.getId(), ex.getMessage());
diff --git a/backend-java/src/main/java/com/nanri/aiimage/modules/deletebrand/service/DeleteBrandRunService.java b/backend-java/src/main/java/com/nanri/aiimage/modules/deletebrand/service/DeleteBrandRunService.java
index 75d7c710..75c4515d 100644
--- a/backend-java/src/main/java/com/nanri/aiimage/modules/deletebrand/service/DeleteBrandRunService.java
+++ b/backend-java/src/main/java/com/nanri/aiimage/modules/deletebrand/service/DeleteBrandRunService.java
@@ -1975,7 +1975,7 @@ public class DeleteBrandRunService {
 
     public String resolveTaskDownloadUrl(Long taskId) {
         FileResultEntity entity = findLatestSuccessfulResult(taskId);
-        return entity == null || entity.getResultFileUrl() == null ? null : ossStorageService.getPublicUrl(entity.getResultFileUrl());
+        return entity == null || entity.getResultFileUrl() == null ? null : ossStorageService.generateFreshDownloadUrl(entity.getResultFileUrl());
     }
 
     public String resolveTaskDownloadFilename(Long taskId) {
@@ -1985,7 +1985,7 @@ public class DeleteBrandRunService {
 
     public String resolveResultDownloadUrl(Long resultId, Long userId) {
         FileResultEntity entity = findDownloadableResult(resultId, userId);
-        return entity == null || entity.getResultFileUrl() == null ? null : ossStorageService.getPublicUrl(entity.getResultFileUrl());
+        return entity == null || entity.getResultFileUrl() == null ? null : ossStorageService.generateFreshDownloadUrl(entity.getResultFileUrl());
     }
 
     public String resolveResultDownloadFilename(Long resultId, Long userId) {
diff --git a/backend-java/src/main/java/com/nanri/aiimage/modules/file/service/oss/OssStorageService.java b/backend-java/src/main/java/com/nanri/aiimage/modules/file/service/oss/OssStorageService.java
index a3e538a2..b77fa248 100644
--- a/backend-java/src/main/java/com/nanri/aiimage/modules/file/service/oss/OssStorageService.java
+++ b/backend-java/src/main/java/com/nanri/aiimage/modules/file/service/oss/OssStorageService.java
@@ -54,7 +54,7 @@ public class OssStorageService {
         String objectKey = resultObjectKey(file, moduleType);
         String bucket = resolveBucket(moduleType);
         uploadFile(file, bucket, objectKey);
-        return new UploadedResult(objectKey, getPublicUrl(objectKey, bucket));
+        return new UploadedResult(objectKey, generateFreshDownloadUrl(objectKey));
     }
 
     public UploadedResult uploadPublicFileWithFreshDownloadUrl(File file, String moduleType, String originalFilename) {
diff --git a/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskService.java b/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskService.java
index ce7abb0c..3fc1c1cd 100644
--- a/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskService.java
+++ b/backend-java/src/main/java/com/nanri/aiimage/modules/similarasin/service/SimilarAsinTaskService.java
@@ -5544,8 +5544,8 @@ public class SimilarAsinTaskService {
         }
         try {
             // bucket 对 result/ 前缀已开放公开读，使用无签名公开 URL，避免签名 1 小时过期后下载 403。
-            // resolveObjectKey 兼容历史存量的旧格式（带签名的完整 URL），统一还原为纯 objectKey 再拼公开 URL。
-            return ossStorageService.getPublicUrl(ossStorageService.resolveObjectKey(resultFileUrl));
+            // result/ 前缀走 download-endpoint 独立下载域名（带宽/缓存分流），非 result/（如图片）仍走公开端点。
+            return ossStorageService.generateFreshDownloadUrl(resultFileUrl);
         } catch (Exception ex) {
             log.warn("[similar-asin] build public download url failed resultId={} err={}",
                     row.getId(), ex.getMessage());