Abstract: In order to study the vertical dynamic transmission characteristics of the constant cross section cylindrical spiral steel spring under the medium and high frequency excitation, a discrete model of the spring is established, and the variation curve of the vertical dynamic stiffness with the excitation frequency is drawn through finite element calculation. The double coil parallel spring group and the series system of spring and rubber pad are simulated and analyzed respectively. In order to further explore the influencing factors on the vertical transmission characteristics, the pre-compression, excitation amplitude and damping ratio of the helical spring and rubber materials are changed sequentially. The results show that with the increase of the excitation frequency, the valley value of the coil spring vertical dynamic stiffness will appear near the resonance frequency, while the peak value appears in a certain frequency range after the resonance frequency, it shows an overall rising trend of fluctuation. The size of pre\|compression and excitation amplitude has no significant influence on the modality and transmission characteristics of the spring; by improving the damping ratio of the material and the rubber pad connected in series at the spring end can both effectively reduce the magnification of vertical dynamic stiffness and the fluctuation range.