Fractional order PIλDμ is a relatively new and high control performance controller. In this paper, the Fractional order PIλ was applied to the double closed-loop DC speed regulation system of speed controller, using particles swarm optimization algorithm to determine the parameters of the controller. The stability, follow performance and disturbance resistance of the fractional order PIλ is superior to integer order PI which was demonstrated by Matlab/Simulink. The effectiveness of particle swarm optimization algorithm parameters setting was verified either.