Abstract: The connection mode between the tower and monopile of the offshore wind turbine has an important impact on structural safety.Based on an offshore wind power project, the influence of the aerodynamic damping of the wind wheel on the dynamic response of the wind turbine structure is studied by numerical analysis method. The natural vibration characteristics and dynamic response characteristics of the structure under different connection modes between tower and monopile are analyzed, and the change of grouting connection effect with elastic modulus of grouting material is compared. The results of numerical analysis show that the aerodynamic damping of the wind wheel has obvious influence on the dynamic response of the wind turbine structure, which should not be ignored in the analysis of the wind induced response of the wind turbine during operation. The top displacement of the tower in grouting connection is smaller than that in variable diameter connection, and the elastic modulus of the grouting material in the grouting connection has no obvious effect on the grouting connection effect.