Abstract: For overcoming the shortcomings of the feeder of the twisting machine, a new type servo feeder based on PCI local bus is developed, in which AC servo motor and PCI-1240 motion controller are adopted. A suitable model is established through the motion analysis of the feeder, the Visual Basic program language and PCI-1240 motion DLL are used to realize modularized design in the software system. The parameters are calculated and converted into control signals by the main program, which drive AC serve motors and executes mechanisms to realize to-and-fro feeder motion, avoiding overlap, convex edge, hard-edge and so on. The experimental results show that the design of the servo feeder can achieve the process goal of yarn guiding, and it is suitable for the latest double, triple and quadruple twisting machines.