Designing horizontal-axis wind turbine (HAWT) blades to achieve satisfactory levels ofrnperformance starts with knowledge of the aerodynamic forces acting on the blades. In thisrnthesis, HAWT blade design is studied first from the aspect of aerodynamic view and thernbasic principles of the aerodynamic behaviors of HAWTs are investigated. Second thernstructural design which consists of the blade material selection and the determination ofrnstructural cross section, FEM analysis is done using CATIA V5 R16 and ANSYS 10. Therndisplacement, Von Mises and Principal stress results are determined, these results shows thatrnANSYS is more conservative than CATIA in FEM analysis.rnBlade-element momentum theory (BEM) known as also strip theory, which is the currentrnmainstay of aerodynamic design and analysis of HAWT blades, is used for HAWT bladerndesign in this thesis.rnBLADE DESIGN PROGRAM which is a user-interface computer program for HAWTrnblade design is written. It gives blade geometry parameters (chord-length and twistrndistributions) and design conditions (design tip-speed ratio, design power coefficient andrnrotor diameter) for the following inputs; power required from a turbine, number of blades,rndesign wind velocity and blade profile type (airfoil type). The program can be used byrnanyone who may not be intimately concerned with the concepts of blade design procedurernand the results taken from the program can be used for further studies.