diff --git a/mainwindow.cpp b/mainwindow.cpp
index d530cf9..4fa938d 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -495,13 +495,13 @@ void MainWindow::sendUpgradePackage(int slot)
     UpgradeCardReq upgrade_car_req;
     uint8_t card_id;
     if(slot == 0)
-        card_id = 0xFF;
+        upgrade_car_req.card_id = 0xFF;
     else
-        card_id = slot & 0xFF;
+        upgrade_car_req.card_id = slot & 0xFF;
 
     header.crc = calculate_crc(upgrade_car_req.card_id,fileData);
     header.len = fileSize;
-    qDebug() << "filheader.crc" << header.crc;
+    qDebug() << "filheader.crc" << header.crc << "card_id" << upgrade_car_req.card_id << endl;
     // 发送头部数据
     //QByteArray packet(reinterpret_cast<char*>(&header), sizeof(PackageHead));
 
@@ -520,25 +520,49 @@ void MainWindow::sendUpgradePackage(int slot)
     send_buf = (char *)malloc(sizeof(PackageHead) + sizeof(UpgradeCardReq) + fileData.size() + 1);
     memset(send_buf,0,sizeof(PackageHead) + sizeof(UpgradeCardReq) + fileData.size() + 1);
     memcpy(send_buf, &header, sizeof(PackageHead));
-    memcpy(send_buf + sizeof(PackageHead), &card_id, 1);
-    memcpy(send_buf + sizeof(PackageHead) + 1, fileData.data(), fileData.size());
-    socket.write(send_buf);
-    socket.waitForBytesWritten();
+    memcpy(send_buf + sizeof(PackageHead), &upgrade_car_req, sizeof(UpgradeCardReq));
+    memcpy(send_buf + sizeof(PackageHead) + sizeof(UpgradeCardReq), fileData.data(), fileData.size());
+
+    int length = sizeof(PackageHead) + sizeof(UpgradeCardReq) + fileData.size();
+
+    const int MAX_CHUNK_SIZE = 50 * 1024;  // 64 KB
+    qint64 bytesSent = 0;
+    qint64 totalBytes = length;
+    qDebug() << "totalBytes" << totalBytes << endl;
+
+    while (bytesSent < totalBytes) {
+        qint64 chunkSize = 0;
+        if(MAX_CHUNK_SIZE < totalBytes - bytesSent){
+            chunkSize = MAX_CHUNK_SIZE;
+        }else{
+            chunkSize = totalBytes - bytesSent;
+        }
+        qint64 bytesWritten = socket.write(send_buf + bytesSent, chunkSize);
+        socket.waitForBytesWritten();
+        qDebug() << "bytesWritten" << bytesWritten << "bytesSent" << bytesSent << endl;
+        if (bytesWritten == -1) {
+            // Handle error
+            break;
+        }
+
+        bytesSent += bytesWritten;
+    }
+
     // 发送头部
     // qDebug() << "File sent successfully";
     // // 等待服务器响应（根据需要处理响应）
 
-    // if (socket.waitForReadyRead()) {
-    //     QByteArray response = socket.readAll();
-    //     UpgradeRsp resp;
-    //     QByteArray byteArray = response.mid(sizeof(PackageHead));
-    //     QDataStream stream(&byteArray, QIODevice::ReadOnly);
-    //     stream >> resp.code ;
-    //     if(resp.code == 1){
-    //         QMessageBox::information(this, QStringLiteral("提示"), "上传成功！");
-    //     }
-    //     qDebug() << "Server response: " << resp.code;
-    // }
+    if (socket.waitForReadyRead()) {
+        QByteArray response = socket.readAll();
+        UpgradeRsp resp;
+        QByteArray byteArray = response.mid(sizeof(PackageHead));
+        QDataStream stream(&byteArray, QIODevice::ReadOnly);
+        stream >> resp.code ;
+        if(resp.code == 1){
+            QMessageBox::information(this, QStringLiteral("提示"), "上传成功！");
+        }
+        qDebug() << "Server response: " << resp.code;
+    }
     // 关闭文件和连接
     file.close();
     socket.disconnectFromHost();