Abstract: In order to deeply understand the influence of each blade stiffness parameter on the aeroelastic responses of wind turbine,this paper systematically studies the influences and sensitivity of each stiffness parameter in the diagonal of the matrix of the blade sections on the aeroelastic responses of wind turbine under steady and turbulence wind condition. The aerodynamic module in aeroelastic model is calculated based on blade element momentum（theory）. The structural dynamic tesponse of the blade is simulated by geometric exact beam theory. The National Renewable Energy Laboratory（NREL）5 MW wind turbine and blade properties are used as standard model in this study,in which the diagonal stiffness coefficients of each blade section are adjusted according to certain principles. The results show that the axial stiffness,the flapping stiffness,the edgewise stiffness and the torsional stiffness in the main diagonal are moderately and highly sensitive to the aeroelastic response. The research results provide certain guiding significance for further mastering the aeroelastic response law of wind turbine and developing blade optimization design method. This method can be further extended to study the sensitivity of blade stiffness to the aeroelastic response of wind turbines.