diff --git a/js/fileuploader.js b/js/fileuploader.js
index ecd6a1954..25b2a998f 100755
--- a/js/fileuploader.js
+++ b/js/fileuploader.js
@@ -1072,7 +1072,8 @@ qq.extend(qq.UploadHandlerXhr.prototype, {
         var queryString = qq.obj2url(params, this._options.action);
 
         xhr.open("POST", queryString, true);
-        xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
+        xhr.setRequestHeader("Content-Type", "application/octet-stream");
+        xhr.setRequestHeader("processData", false);
         xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
         xhr.setRequestHeader("X-File-Name", encodeURIComponent(name));
         xhr.send(file);