Abstract: Ice loads are an important and decisive factor affecting the safe operation of offshore wind turbines. In severe cases,it shall lead to ice-induced vibration damage and ice-induced fatigue failure of offshore wind turbine structures. Based on the cohesive element method（CEM）and finite element method（FEM）and considering the pile-soil interaction through nonlinear distributed springs,a nonlinear finite element model of the fully ice-monopile offshore wind turbine structures in sea ice-cold regions is established.Furthermore,based on the numerical simulation tool LS-DYNA,the interaction process of ice with the vertical structure and the supporting structure with ice-breaking cones are simulated respectively,and compared with the ice force model proposed in the specifications to verify the accuracy of the simulated dynamic ice loads. Finally,the vibration control method and the ice-breaking method are used to study the dynamic response of offshore wind turbines under the combined action of wind and ice,and the differences between the both vibration reduction methods were compared. The results show that the cohesive element method adopted in this paper can well simulate the crushing and bending failure processes of sea ice. Meanwhile,the vibration reduction effect of the offshore wind turbine using the vibration control strategy is better than that of applying the ice-breaking method.