Abstract: The steel-concrete hybrid wind turbine tower is characterized by the lower part of the traditional steel tube tower replaced with the concrete segment.Its lateral stiffness will be improved obviously and then the excessive vibration of the traditional steel tower can be avoided effectively.Based on the improved genetic algorithm,an optimization model is developed to consider the influence of materials,labor,fabrication and transportation on its construction cost.The bottom and top diameters of the tower tube,the wall thickness of each segment,the height of the concrete segment and the area of the prestressed steel strand are taken as the optimization variables.The design requirements in the relevant specifications and industry standards are used as the constraint conditions.A steelconcrete hybrid tower for a 2.0 MW wind turbine with a hub height of 120 m and 32 m concrete segment is taken as an example to validate the effectiveness of the proposed model.By comparing the construction costs and structural capacities before and after optimization,it can be found that the steel-concrete hybrid wind turbine tower after optimization has the better structural stiffness and lower construction cost.The proposed optimization model can meet the design requirements and significantly improve the economic performance of wind turbine tower.