Abstract: Aiming at the problem of the first-order vortex induced vibration of the steel tower of the wind turbine generator system（WTGS）,the first-order vortex induced vibration characteristics of the whole WTGS are studied by using the simulation method of solid fluid combination. Firstly,taking a 2.5 MW and 140 m tower unit as the research object,a tower-blade coupling simulation structure model is established. The resonance frequency and resonance wind speed range of the first-order vortex induced vibration of the whole WTGS are analyzed by modal and CFD simulation,which shows that the wind turbine tower has the risk of first-order vortex induced vibration. Then,a fast simulation method based on solid fluid iteration is proposed to calculate the first-order vortex induced vibration displacement. Considering the coupling effect of the blades on the vortex-induced vibration of the tower,the maximum vibration displacement is obtained. Field tests show that the measured maximum first-order vortex-induced vibration displacement is basically consistent with the simulation results,which verifies the accuracy of the simulation method.