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Aerodynamic load is one of the important loads that must be considered for wind-wave energy hybrid devices. In this study, the effects of blade angle and foundation structure vibration on aerodynamic loads are considered, and the traditional blade element momentum (BEM) is dynamically modified by the method of coordinate matrix transformation and vibration function analysis, starting from the relative inflow angle and the instantaneous wind speed of the wind turbine, and the aerodynamic loads of the wind turbine were simulated by using the improved BEM theory. The correctness of the proposed method in this study is verified by comparing the data of a large number of researchers and the computational results of OpenFast. A simulation study has been carried out using AQWA, combining the modified aerodynamic load of the wind turbine and the hydrodynamic load of the wave energy device, to analyze the variation trend of the base structure response of the wind-wave hybrid device under general and extreme conditions. The results show that the method developed in this paper can provide theoretical reference for the development and stable operation of wind-wave hybrid device. • In this study, the classical BEM theory was modified based on the blade installation angle and foundation structure vibration. • The load fluctuation rules of the structure under the combined effect of blade angle and foundation vibration were revealed. • The distribution rules of the axial thrust of the blades were obtained by considered the effects of wind shear and fluctuating wind on the aerodynamic loads. • The response change rules of the foundation structure of hybrid devices under general and extreme conditions were analyzed. [ABSTRACT FROM AUTHOR]