The on-board weighing technology was studied for the overloading of vehicle. A monitoring system was designed for overloading based on the on-board weighing device and short message technology. The system used paste-type strain sensor that installed in vehicle-s leaf spring to obtain load on the leaf spring and then calculated and displayed the total load of vehicle. When vehicle is overloaded the monitoring device control on-board short message terminals to send a short message of overloading,also it provided data to the relevant departments. The system can accurately detect the vehicle load after repeated verification, which can be used for the departments of transportation and highways to charge, manage and punish the loading vehicle.