Abstract: Wind turbines (the windmill) is a conversion device that turn wind energy into
mechanical energy, electrical energy or thermal energy. The vertical axis wind turbine has some
advantages over the horizontal axis wind turbine. The small H-vertical axis wind turbine blades
are analyzed. The load in different working environments are also analyzed. Stress calculation and
checking methods are discussed. It can provide a reference for small H-vertical axis wind turbine
blade design.

Key words: wind turbines, vertical axis, blade, load analysis, checking