The actuator and controller of electromechanical brake (EMB) were designed. The simulation model of EMB was built in Matlab/Simulink. The controller of motor adopted three loops control architecture with cascaded force, speed and current control loops，and the design method of controller was given. Computer simulation on three-typical-condition of step input, half cosine input and pulse input has been carried out. The results showed that the brake pressure of EMB could follow the target accurately and the performance of EMB is good. The comparison of hydraulic brake and EMB showed that EMB could regulate brake force more quickly and accurately.