Abstract: Blade plays a key role in the wind turbines, which determines the performance of the machine to a large extent. This paper studies the Pituitrin-Momentum theory and puts forward the general steps and methods of blade design in order to gain maximum aerodynamic efficiency of wind turbines. To meet the requirements of the blade pneumatic continuity,radiation fitting method is present to realize the smooth transition on the surface of the blade. Then, according to the principle of coordinate change, the coordinates of cross profile are translated from two-dimensional space to three-dimensional space.At last, ANSYS software is carride out on three-dimensional entity modeling through a bottom-up approach. The present paper lays a foundation for further optimization and analysis of the blade.

Key words: wind turbine, blade design, entity model