Abstract: A mathematical model for the multi-objective optimization design is established for the purpose of reducing the cost and improving the operation reliability of a wind turbine. The model has two objectives?: the minimum blade mass and the maximum annual energy production. The key design parameters involve the geometric dimensions, structural and operation parameters while the demand of strength of the blade is employed as the main constraint condition. The optimization-shape design is carried out for a 1.5MW wind turbine blade by combing above objectives and constraint conditions with Pareto Genetic Algorithm. Compared with the original blade, the best shape design achieves an increase of annual energy production accompanied with a decrease of blade mass, therefore its effectiveness is verified.