diff --git a/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java b/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java
index 9b36eea..24aef54 100644
--- a/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java
+++ b/cloud-common-plugin/src/main/java/com/cm/common/plugin/service/file/impl/FileServiceImpl.java
@@ -251,6 +251,8 @@ public class FileServiceImpl extends AbstractService implements IFileService {
      * @param contentLength
      */
     private void setRangeHeader(long startRange, long endRange, HttpServletResponse response, String fileId, long contentLength) {
+        // 这里不设置，会出现第一次加载很慢的情况
+        response.setHeader("Content-Length", String.valueOf(contentLength - startRange));
         response.setHeader("Content-Range", String.format("bytes %d-%d/%d", startRange, endRange, contentLength));
         response.setHeader("Accept-Ranges", "bytes");
         response.setHeader("Etag", fileId);