Abstract: Suction bucket is widely used in offshore wind power foundation because of its strong adaptability,installation convenience and lower cost. However,this kind of shallow foundation structure is easily affected by the seabed foundation. In order to ensure the safe operation of offshore wind turbine,it is necessary to monitor the foundation structure of wind turbine in real time. The first monitored offshore wind turbine with steel suction bucket established in East China Sea is analyzed numerically. Firstly,the environmental loads are analyzed. The suction bucket model and the structure model are established respectively. Then,the inclination of wind turbine is calculated by using superposition principle. The stresses of the bucket and wind power structure under different working conditions are calculated. And the deviation of static and dynamic parameters of each monitoring point on the turbine are predicted. The reasonable range of monitoring parameters are and determined. Finally,the thresholds of monitoring parameters for establishing the on-line and alarm system of the turbine are obtained. And the alarm strategy is analyzed. Thus,an important reference for the operation and maintenance safety of offshore wind turbine with shallow foundation is provided.