Abstract: With the development of power grid construction,there will be more and more transmission lines across the country.However,the traditional all-steel poles and towers have some defects,such as heavy quality,rust-prone,consuming a lot of mineral energy and so on. At this stage,the composite material technology is becoming more and more mature. So,a composite tower scheme is proposed to improve the economy and reliability of towers. Firstly,the size and insulation configuration of tower head are determined according to the requirements of clearance circle and finite element electric field analysis,so as to make the electric field distribution more uniform. Secondly,based on the analysis of the performance of composite materials,the force analysis of composite tower is carried out by using ANSYS software to confirm the component size and check the bearing force under various working conditions. Finally,the cost of composite tower is calculated and compared with the traditional all-steel tower. The calculation and simulation results show that the proposed 500 k V double circuit composite towers meet the load and insulation requirements under various working conditions,and has a good economy.