diff --git a/src/main/java/com/yxtech/ossyn/service/OssSyncService.java b/src/main/java/com/yxtech/ossyn/service/OssSyncService.java
index 06f8fda..956632a 100644
--- a/src/main/java/com/yxtech/ossyn/service/OssSyncService.java
+++ b/src/main/java/com/yxtech/ossyn/service/OssSyncService.java
@@ -171,11 +171,24 @@ public class OssSyncService {
             for (Map<String, String> row : rows) {
                 String bizId = row.get("id");
                 String filePath = row.get("filePath");
-                Long exists = ossFileLogMapper.selectCount(new LambdaQueryWrapper<QhOssFileLog>()
+                QhOssFileLog existing = ossFileLogMapper.selectOne(new LambdaQueryWrapper<QhOssFileLog>()
                         .eq(QhOssFileLog::getBizTabName, mapping.getTableName())
                         .eq(QhOssFileLog::getBizTabId, bizId)
-                        .eq(QhOssFileLog::getBizColName, mapping.getFileCol()));
-                if (exists > 0) {
+                        .eq(QhOssFileLog::getBizColName, mapping.getFileCol())
+                        .last("LIMIT 1"));
+                if (existing != null) {
+                    // 路径未变，跳过；路径已变（业务重新上传），重置为待处理
+                    if (filePath != null && filePath.equals(existing.getBizTabPath())) {
+                        continue;
+                    }
+                    log.info("[OssSyncService] 检测到文件路径变更，重置日志 id={} 旧路径={} 新路径={}",
+                            existing.getId(), existing.getBizTabPath(), filePath);
+                    ossFileLogMapper.update(null, new LambdaUpdateWrapper<QhOssFileLog>()
+                            .eq(QhOssFileLog::getId, existing.getId())
+                            .set(QhOssFileLog::getBizTabPath, filePath)
+                            .set(QhOssFileLog::getBizHandleStatus, QhOssFileLog.STATUS_PENDING)
+                            .set(QhOssFileLog::getOssPath, null)
+                            .set(QhOssFileLog::getUpdateTime, LocalDateTime.now()));
                     continue;
                 }
                 QhOssFileLog record = new QhOssFileLog();
diff --git a/src/main/java/com/yxtech/ossyn/util/OssUtil.java b/src/main/java/com/yxtech/ossyn/util/OssUtil.java
index 5aa66f1..aa9c40d 100644
--- a/src/main/java/com/yxtech/ossyn/util/OssUtil.java
+++ b/src/main/java/com/yxtech/ossyn/util/OssUtil.java
@@ -120,6 +120,10 @@ public class OssUtil {
 //        } else {
 //            fileName += "_" + System.currentTimeMillis();
 //        }
+        // json 文件改为 txt 后缀上传（OSS 不支持 json 类型）
+        if (fileName.toLowerCase().endsWith(".json")) {
+            fileName = fileName.substring(0, fileName.length() - 5) + ".txt";
+        }
         String nowday = new SimpleDateFormat("yyyyMMdd").format(new Date());
         final String finalFileName = DIR + bizPath + "/" + nowday + "/" + fileName;
         return doUpload(stream, url, finalFileName);