Car suspension is the general term for all force transmission connection devices between the frame, axle or wheel of a car. Its function is to transmit forces and torque acting between the wheel and the frame, and to cushion the impact force transmitted from uneven road surfaces to the frame or body, and attenuate the resulting vibrations to ensure smooth driving of the car.

Motor vehicle springs are mainly developing towards high strength to reduce weight; Electronic product springs are mainly developing towards miniaturization; And optical device springs are mainly developing towards both high strength and miniaturization. Corresponding spring design methods, materials, and processing technologies have been developed.