The paper analyses the error sources which contribute to the kinematic accuracy of servo-feed mechanism of ultra-precise lathe. On the basis of this

this paper brings on some methods for eliminating the error source by modifying machine structure of the servo-feed mechanism instead of increasing the manufacturing accuracy of the lathe′s components. Those methods mainly inlcude applying multi-throttle air-lubricated hydrostatic slide guide and mounting a float unit on the screw pair. After applying those methods to the servo-feed mechanism of the ultra-precise lathe

the kinematic accuracy of the servo-feed mechanism can meet the requirements of ultra-precise Machining.