In order to the problem of long development cycle and poor stability of the whole vehicle control system, this paper studies the whole vehicle control problem by designing a whole vehicle control system of pure electric vehicle. The system was used investigate based on freescale S12 processor development ECMV2 hardware module, software was the underlying driver Code Warrior IDE for HCS12 as development environment to create software engineering, encapsulated into a simulink graphical module, provided all onboard a peripheral driver library, and provided the GUI interface for configuration, made the software and control algorithm based on the same platform to build and verify, and to establish the module of the vehicle model and control strategy. The results show that the time difference of the peak torque of the motor is 1s.The acceleration process of vehicles is relatively stable;Battery voltage does not drop quickly;The operation of the driver is also quickly responded It is concluded that the controller of this system is highly sensitive, the motor responds quickly and the vehicle runs smoothly.Compared with the traditional development form, the development time of this system is greatly shortened, and the stability and reliability of the whole vehicle controller are enhanced.