As an important physical parameter of the air-spring isolation platform

the natural frequency also plays vital role in the evaluation of the vibration isolation transfer rate.However

whether the theoretical calculation and the experimental natural frequency accord with each other is still obscure.In order to solve this problem

the dynamic models of the air-spring isolation system are improved and the theoretical calculation natural frequency is 1.28 Hz based on an isolation system.Impact experiments are carried out in lab and the experimental natural frequency is 1.22 Hz using FFT method.The relative error between the two is less than 5 %

which reaches the expectations

and the error sources are briefly analyzed.