Abstract: The paper gave a simulation model of common DC double closed-loop speed-regulation system and used Matlab to simulate the model,and made a conclusion: the common DC double closed-loop speed-regulation system has a better dynamic and static characteristics and can restrain influence of disturbance on rotation speed of motor.But the system depends on accurate mathematical model,which not only increases solution links but also makes system’s model more complex and may affect reliability of the system.On the basis of the analysis result,the paper proposed a design scheme of DC double closed-loop speed-regulation system based on fuzzy control + PI rotation speed regulator.In the scheme,the current loop still uses common PI regulation and rotation speed loop uses time-sharing action mode of fuzzy controller and common PI(regulation.) The simulation result showed that the new system introduced in fuzzy controller has advantages of high response speed,steady transition and improves system overshoot.