Abstract: The structure, principle and application effect of a two-point center frame with servo system are introduced in this paper. The device has simplified and compact middle structure from the driving end to the output end of the action, it has few transmission links. It can automatically track the change of workpiece size in the grinding process, so it can greatly improve the grinding accuracy, quality and stability. As a functional part of the machine tool, it can improve the overall quality and value of the machine tool.