diff --git a/src/mqtt_report/src/mqtt_report.cpp b/src/mqtt_report/src/mqtt_report.cpp
index 9e9783a..f5ad316 100644
--- a/src/mqtt_report/src/mqtt_report.cpp
+++ b/src/mqtt_report/src/mqtt_report.cpp
@@ -38,6 +38,8 @@ void Msg_Handler(const mc::msg::CanFrame::SharedPtr msg)
         float gear_ratio = 32.0;
         float wheel_radius = 0.15; // 轮胎半径，单位米
         float vehicle_speed_kmh = (2 * 3.1416 * wheel_radius * (motorspeed / gear_ratio) * 60.0) / 1000.0;
+        // 保留两位小数
+        vehicle_speed_kmh = std::round(vehicle_speed_kmh * 100.0f) / 100.0f;
         info_report.speed = vehicle_speed_kmh;
         break;
     }
@@ -256,12 +258,14 @@ int main(int argc, char **argv)
 
     if (!load_config(config))
     {
-        std::cerr << "Failed to load MQTT config." << std::endl;
+        RCLCPP_ERROR(rclcpp::get_logger("main"), "Failed to load MQTT config.");
         return 1;
     }
 
     auto node = std::make_shared<CanDataSubscriber>(config);
 
+    RCLCPP_INFO(node->get_logger(), "MqttReport node started.");
+
     rclcpp::spin(node);
     rclcpp::shutdown();
     return 0;