Based on building wind whole machine model of floating type of Umaine-Hywind Spar platform and according to hydrodynamic characteristics analysis, the paper mainly researched the time domain and frequency domain response of the the structure. It used the water power calculation module in finite element software ANSYS, considered the joint load of wind, wave and flow for the time domain and frequency domain properties of wind machine platform. Through observating the location variation of platform with time,the paper analyzed the dynamic response characteristics of platform; Respectively studied the component's contribution of wave forces to the structure motion, and probed into the change trend of wave force with frequency. Results show that the structure appears large response under the effect of low frequency waves, including amplitude response operator and the wave force; In the main composition of wave force, added mass force peak is maximum; Deflection movement of the structure under the action of external load platform is more significant than that of horizontal displacement.