Suspensions play a crucial role for comfort and handing of vehicles.The conventional air suspension systems chassis height can be controlled by further inflating the airbag, however, the suspension stiffness is not controllable. Therefore, a new air suspension allowing independent ride height and stiffness tuning was developed. In this air suspension system, the stiffness and ride height of the vehicle could be simultaneously altered for different driving conditions; the vehicle’s natural frequency and height could be adjusted according to load and road conditions. The optimization of the air suspension design with ride height and stiffness tuning was discussed, the optimum design of the new air suspension system was developed and the advantages of the new air suspension system were shown.