Active body control system is an important system for determining the driving stability and ride comfort of the vehicle. Active body control system is composed of a cylinder unit power supply unit, and control valve unit. Control valve is a proportional pressure control valve, the dynamic characteristics of the valve affects the performance of the active body control system. We have developed an analytical model, we analyzed the design parameters of the proportional pressure control valve. Further, by knowing the design parameters effect on the system and to optimize the design parameters, and improved performance of the dynamic properties.