diff --git a/MultiplethreadDownload/widget.cpp b/MultiplethreadDownload/widget.cpp
index 7b2b2f8..e4cd93e 100644
--- a/MultiplethreadDownload/widget.cpp
+++ b/MultiplethreadDownload/widget.cpp
@@ -149,6 +149,7 @@ void Widget::multiDownload(const QString &url, qint64 fileSize, const QString &f
     vec[threadCount-1].second = fileSize; // 余数部分加入最后一个
 
     qint64 bytesReceived = 0; // 下载接收的总字节数
+    QMutex lock;
     // 任务队列
     auto mapCaller = [&, this](const QPair<qint64, qint64>& pair) -> qint64 {
         QEventLoop event;
@@ -159,16 +160,15 @@ void Widget::multiDownload(const QString &url, qint64 fileSize, const QString &f
         request.setRawHeader("Range", QString("bytes=%1-%2").arg(pair.first).arg(pair.second).toLocal8Bit());
         QNetworkReply *reply = mgr.get(request);
         qint64 writePos = pair.first;
-        QMutex lock;
         qDebug() << "开始下载数据：" << QString(" %1~%2 -> writePos Start %3")
             .arg(pair.first).arg(pair.second).arg(writePos);
         connect(reply, &QNetworkReply::readyRead, [&lock, &writePos, &file, &bytesReceived, reply](){
             QByteArray data = reply->readAll();
             {
                 QMutexLocker mLock(&lock);
-        //            qDebug() << "调整文件的数据指针："  << writePos;
-//                file.seek(writePos);
-//                file.write(data);
+//                qDebug() << "调整文件的数据指针："  << writePos;
+                file.seek(writePos);
+                file.write(data);
                 bytesReceived += data.size();
                 qDebug() << QString("%1, %2, %3")
                     .arg(writePos).arg(bytesReceived).arg(data.size());