Abstract: Because the construction and operation principle of the switched reluctance(SR) motor is very special,analysis and design of its control system are more difficult than the other motors.In this(paper),a nonlinear simulation model of speed regulating system of a four-phase(8/6) SR motor was established based on Matlab 7.0/Simulink.The result of simulation showed the real performances of the SR(motor) and proved the model is effective and feasible.