To explore the load changes of the damaged wind turbine blades at the leading edge under the wind and sand environment,the numerical simulation for the damaged blades was carried out based on finite element method,to study the effects of different loads,different erosion levels and different materials on the stress,displacement,and natural frequency of the blade.The results show that:when the erosion degree is between 0 mm×0 mm and 1 mm×1 mm,the depth and thickness of erosion have little effect on the stress of the blade;as the density of the blade material increases and the rotation speed of the wind wheel increases,it has a greater impact on the stress of the blade;although increasing the wind speed increases the blade aerodynamic load and the overall blade stress,the stress trend does not change significantly;increasing the erosion degree has small influence on the blade displacement;increasing the wind speed or the rotation speed of the wind wheel will increase the maximum displacement value of the blade tip,and at the same time,the displacement of the blade with high material density will be greater;in the first three-order modal analysis of the blade,the erosion degree has minimal influence on the blade;in the eighth-order mode,the natural frequency of the blade gradually decreases as the erosion degree increases.