Abstract:High voltage direct current (HVDC) transmission system has been used widely in our country with its advantages of transmission of large amounts of power over long distance, asynchronous link between two AC system and ability to rapid control. The control parameters of HVDC system directly affect the operation characteristics of HVDC system, so it is very important to optimize the control parameters of HVDC system. In this paper, the traditional HVDC system is taken as the research object, and MATLAB/SIMULINK is used as the simulation platform. Based on the simple memory strategy, the traditional genetic algorithm is improved by keeping the optimal individual in the lowest fitness position after each generation of optimization, and the improved genetic algorithm is used to optimize the control parameters of HVDC.The genetic algorithm and HVDC system model are combined to simulate by MATLAB, and the optimal controller parameters are obtained by iteration. At the same time, the controller parameters after optimization are compared with the robustness of the original parameters, which proves the necessity of controller parameter optimization and the feasibility and superiority of genetic algorithm in optimizing controller parameters.