Abstract: Aiming at the output fluctuation problem of DC-DC converter in photovoltaic power generation system caused by disturbances such as load and working environment conditions, a design method of genetic active disturbance rejection controller（ADRC） for DC converter based on D-partition method is proposed. This method is suitable for the design of bidirectional DC-DC converters in the field of photovoltaic power generation, the D-partition method is used to obtain the parameter range of ADRC controller that satisfies the robust stability of the closed-loop system; The genetic algorithm with global optimization ability is used to optimize the parameters in this range according to the comprehensive performance index. The experimental results show that the design method of genetic active disturbance rejection controller for DC converter based on D-partition method mentioned in this paper can effectively suppress DC bus voltage fluctuation and load jump, improve the robustness of the controller, and improve the dynamic response performance and antiinterference ability of the photovoltaic power generation system.