The coordination control method of microgrid was one of the most important technologies in microgrid, and the master slave control method was a common method in the coordinated control of microgrid. Aiming at the problems existing in the traditional master slave control, a new type of master slave control strategy with auxiliary micro source was presented. On the basis of traditional masterslave control, it added a droop control of auxiliary control unit which could be with the main control unit together to support micro network voltage and frequency stability, and could be the new main control unit when the main control unit fails. The method overcame the danger that the traditional master slave control system adopted a single main control unit , and the stability of the master slave control mode was enhanced. The effectiveness and feasibility of the proposed control strategy were verified by MATLAB/Simulink software simulation.