Abstract: The electronic shogging system on warp-knitting machines usually controlled by the traditional PID, which is hard to achieve high speed, high response and accurate positioning. Based on the analysis of physical model of servo motor, the three-closed-loop PID control system composed of traditional position loop, speed loop and current loop was designed. And also, introducing the feedforward control of current loop and speed loop into the system to improve the high-speed positioning control performance of the bar. After that, with the simulation achieved by the Matlab and the testing on RSE4-1 high-speed warp knitting machine, the results indicated that of the signal tracking performance of control system can be improved effectively by using the feedward PID control. Compared with the electronic shogging system controlled by the traditional PID control, the positioning time was shortened 2ms, and the much faster response together with more accurate positioning were achieved.