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Abstract-During the yaw control, the load characteristics of yaw system are the key issue to influence the safety and reliability of the wind turbine yaw system. In this paper, based on Von Kammon spectal and EDC wind in IEC standard the 5MW wind turbine generator system model is established considering the impact of gravity load, aerodynamic load and inertia load. The dynamic characteristics of a 5MW offshore wind turbine are analyzed when yawing used FAST software to study the effects of different wind conditions, yaw speed. The results show that the pitching rate has a great affect to the load on yaw bearing since pitch during the yaw. The fatigue and extreme load fluctuation changed in different turbulent intensity of the wind.