Each of the wheel independent suspension system side is determined separately in the system is suspended below the frame or body by elastic suspension. Its advantages are: light weight, reducing the impact received by the vehicle body, and improves the adhesion of the ground wheels; available small spring stiffness of softer, improve the comfort of the car; the engine can be lowered position, the center of gravity cars also reduced so improve vehicle driving stability; beat separate left and right wheels, independent of each other, can be reduced and vibration of the vehicle body is inclined. However, independent suspension system, there is a complex structure, high cost and maintenance inconvenience shortcomings, at the same time because of the complex structure, it will occupy some of the interior passenger space.
Modern cars are mostly independent suspension system, according to the different structure, independent suspension system can be divided into horizontal arm, a vertical arm, multi-link, candle and McPherson suspension systems.