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Aiming at the global efficiency of solar chimney power plant (SCPP),we design a wind turbine generation device to elevate its electricity generating efficiency.Based on wind power utilization theory,a new method is proposed to design a type of wind turbine blade for SCPP.The lift and resistance coefficients on different Reynolds numbers of NACA4418 airfoil,which is suitable for experimental solar electricity generation system,are determined by Profili-V2.0 airfoil design software,a program written in Matlab to calculate chord length of the airfoil.The optimization is conducted by class-shape-transformation (CST) parameterization method and Xfoil software.An airfoil design program is designed on the basis of blade element theory and attack angle with the highest lift coefficient to iteratively determine the inflow angle and setting angle.Prandtl’s tip-loss factor is applied to correct the setting angle,after the airfoil data are input into AutoCAD to build an airfoil model which is then imported into Solidworks to draw blades.A new way is put forward to design wind turbine blades in SCPP.