diff --git a/src/main/java/com/threecloud/dataserviceyy/service/VaaSyncService.java b/src/main/java/com/threecloud/dataserviceyy/service/VaaSyncService.java
index 77241fb..347c85b 100644
--- a/src/main/java/com/threecloud/dataserviceyy/service/VaaSyncService.java
+++ b/src/main/java/com/threecloud/dataserviceyy/service/VaaSyncService.java
@@ -193,12 +193,13 @@ public class VaaSyncService {
             vaaHttpUtil.httpDown(fileUrl, localPath, authToken);
             logger.info("【重新同步】录音下载完成: {}", fileName);
 
-            // 8. 上传OSS（路径与原记录一致，覆盖同名文件，业务表无需更新）
+            // 8. 上传OSS（复用原OSS文件名覆盖，业务表无需更新）
+            String ossFileName = extractOssFileName(record.getRecordingFilePath(), fileName);
             String ossPath = "voice/" + cityCode + "/" + new SimpleDateFormat("yyyy-MM-dd").format(callStartTime) + "/";
-            OssFileResponse ossResponse = uploadRecording(localFile.toFile(), fileName, ossPath);
+            OssFileResponse ossResponse = uploadRecording(localFile.toFile(), ossFileName, ossPath);
             String previewUrl = ossResponse.getFileUrl();
             if (previewUrl == null || previewUrl.trim().isEmpty()) {
-                throw new IllegalStateException("OSS上传成功但未返回文件地址: " + fileName);
+                throw new IllegalStateException("OSS上传成功但未返回文件地址: " + ossFileName);
             }
             ossFilePath = previewUrl;
 
@@ -261,6 +262,28 @@ public class VaaSyncService {
         return callRecordId;
     }
 
+    /**
+     * 从原录音的 OSS 地址中提取 OSS 文件名（URL 最后一段），用于重新同步时覆盖原文件。
+     * 若地址为空或无法提取，则回退为录音盒原始文件名。
+     */
+    private String extractOssFileName(String recordingFilePath, String fallback) {
+        if (StringUtils.hasText(recordingFilePath)) {
+            String path = recordingFilePath;
+            int queryIdx = path.indexOf('?');
+            if (queryIdx >= 0) {
+                path = path.substring(0, queryIdx);
+            }
+            int slashIdx = path.lastIndexOf('/');
+            if (slashIdx >= 0 && slashIdx < path.length() - 1) {
+                String name = path.substring(slashIdx + 1);
+                if (StringUtils.hasText(name)) {
+                    return name;
+                }
+            }
+        }
+        return fallback;
+    }
+
     /**
      * 保存重新同步操作记录到 mid_voice_resync_log 表
      */
diff --git a/src/main/java/com/threecloud/dataserviceyy/util/OssFileService.java b/src/main/java/com/threecloud/dataserviceyy/util/OssFileService.java
index ff69417..b19cbe3 100644
--- a/src/main/java/com/threecloud/dataserviceyy/util/OssFileService.java
+++ b/src/main/java/com/threecloud/dataserviceyy/util/OssFileService.java
@@ -89,6 +89,8 @@ public class OssFileService {
             MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
             body.add("file", resource);
             body.add("path", path);
+            // 指定最终文件名，OSS 服务端按此名字落盘；同名文件覆盖
+            body.add("fileName", fileName);
 
             HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);