Abstract: The commonly used Weibull distribution cannot accurately describe the practical wind speed because of its Gaussian nature.In order to more accurately describe the non-stationary and non-Gaussian nature of the wind speed,a Lévy index wind speed model is established. 6 sets of 2 MW wind turbine with the installation time, running environment similar were studied for comparing the change interval of Weibull distribution index with Lévy index. The comparison results show that the Weibull distribution cannot reflect the difference during the service period of the unit,while the wind speed at the hubs of the unit is relatively stable when Lévy index is smaller. The wind speed at the hubs of the unit in the middle zone is easy affected by the wake of other units and the mainstream wind speed. It is easy to enhance the instantaneous turbulence at the hub and accelerate the degradation of components. The non-stationary and non-gaussian wind velocity models of Lévy index can provide support for further analysis of wind load on wind turbine,and also provide reference for micro-site selection of wind turbine and subsequent maintenance of unit components.