Global warming increases probability of extreme weather,and an extreme temperature has great influence on working equipment. The composite material's initial failure under changing environment for 2MW wind turbine blade was been studied. Basing on the Xinjiang' s climatic feature,the changing temperature and aerodynamic loading was combined via finite element method. The results shows that the change in temperature could varies the blade's properties,and reduces the servicing life at the same time by producing large load of blade,resulting in large equivalent stress,deformation and finally cracks on blades.