Abstract: In the bladed software for wind turbine load calculation, calculation of the loads of wind turbine blade is base on the cantilever beam theory, and the blade is treated as a cantilever beam. In the bladed software, it needs input some cross-section property of blade to create the wind turbine blade′s model. To calculate the cross-section property of blade,the basic principle of engineering mechanics was used in this text. Meanwhile, the computer graphics technology and Matlab which is a programming software to develop the calculating software of blade cross-section should be applied. This software can calculate random blade cross-section property by automatically reading the layer-up information of blade. This text compared the results of the engineering theory calculation method and finite element method, and the error can be accepted. This program of cross section property calculation can provide an efficient design method for structural engineer, and it also reduces the design time and improves the work efficiency.

Key words: blade, composite, engineering mechanics, computer graphics, cross-section property