A new type of electro hydrostatic actuator brake system was presented, which was based on the analysis of the structure of electro hydrostatic actuator brake system and the application of electro hydrostatic actuator technology in aircraft steering gear. And the two kinds of electro hydrostatic brake system were analyzed. The simulation results show that the dynamic performance and braking efficiency of the optimized Electro Hydrostatic Actuator brake system can meet the requirements of the brake system, and its dynamic performance frequency is higher than that of the former.