This paper is based on the Beidou satellite navigation system for heavy trucks weighing dynamic monitoring of a system overload, overload monitoring paper discusses the principle of overload monitoring systems, methods, and each unit of software and hardware components. Monitoring system to collect by pasting on a heavy-duty truck suspension strain gauge load data of the vehicle by AD analog to digital conversion process to the MCU information via CAN bus, MPU6050 to correct the inclination of the vehicle due to the load variation caused Beidou satellite module the position of vehicle, data collection can be saved to the system's EEPROM can be transmitted to the relevant regulatory authorities, to prevent overloading of trucks, vehicle driving safety effectively protected. Experimental tests proved that the strain gauge on the vehicle can have a load deformation when the measured vehicle load changes, via CAN bus data information is displayed on the LCD screen, satellite packets can be updated in real time, can be carried out on the vehicle monitoring system .