Abstract: A law governing the statistically optimal damping control of vehicle suspen -sions is derived applying methods of optimization, and a three - level optimal damping control strategy is proposed in accordance with the range of the vehicle body' s acceleration vibration response: These three optimal dampings will in their turn satisfy the vehicle' s optimal comfort performance, optimal overall travelling performance and optimal stability respectively. An optimal damping control system is designed and completed. The results of a two -DOF model experiment indicate that the vehicle suspension model' s acceleration response and relative working space can be improved through the application of such control systems, and the vehicle' s overall travelling performance is also improved. The control system is simple , reliable and may be extended for use in four -wheels vehicle' s suspensions.