In a tracking and control system, the tracking accuracy of the control system mainly depends on the features of the object in the velocity loop. According to the basic principle of current negative feedback and through adding some current feedback sensors on the basis of position and velocity dual-loop, a current loop is designed. The simulation and experiment results show that the control object character is effectively improved and the low-frequency gain of the velocity loop is raised by the current loop. The tracking accuracy of the position loop in the control system is enhanced by about 10 times.