Abstract: As a kind of vibration isolation component of computating device onbord, a new type of air spring with series double additional gas chambers is designed. According to the property of air springs structure, the dynamics model of air spring is established on the basis of the air continuity equation, the state equation, the energy equation and the stress state of air spring. The nonlinear property of air spring, the radius change of two throttle orifices, the effect of double gas chambers volume change on the damping ratio and the result of air springs vibration isolation are all discussed. The results show that the designed air spring owns the property of periodic nonlinear while the nonlinear property increases with the initial energys increase. Moreover, when the initial volume of every gas chamber is unchanged, the damping ratios maximum value of air spring is first relative to the throttle orifice I and then is only relative to the orifice Ⅱ when the diameter of throttle orifice I is big enough. When the total volume of double gas chambers is invariable, the damping ratio decreases with the increase of volume ratio between the additional chamber A and the additional B. Whatever the change of volume ratio between the two additional gas chambers occurs, it remains invariable to the radius of throttle orifice Ⅱ which results in the maximum damping. The air spring with double additional gas chambers owns the better effect on vibration isolation than the air spring with single additional gas chamber.