Abstract: Combining permanent magnetic suspension support with flow-induced vibration tidal current energy conversion device,the application feasibility of a permanent magnetic suspension support structure as permanent magnetic spring in the field of flow-induced vibration power generation is explored. In order to compare the influence of the restoring force provided by the permanent magnet spring and the metal spring on the flow-induced vibration of the rigid cylindrical oscillator,the magnetic force of the permanent magnet spring is calculated by ANSYS Maxwell software,and the elastic restoring force curve equation of the permanent magnet spring is fitted. The amplitude-frequency characteristics of rigid cylindrical oscillators at different flow rates are calculated by substituting the elastic restoring force curve equation into Star-CCM+,and then the calculated results are compared with the metal spring system. The results show that the flow-induced vibration amplitude-frequency characteristics of the permanent magnet spring support oscillator are similar to those of the metal spring,the upper branch can reach the maximum amplitude ratio,and the frequency increases with the increase of the flow velocity. However,in the calculated flow velocity range,the amplitude ratio and frequency of the permanent magnet spring support oscillator are larger than those of the metal spring-supported oscillator,and the vibration performance is better.