The development of CNC vertical lathe is more and more strict with the spindle. The application from traditional bearing structure to Cross Roller Bearing is not only the development of science and technology, but also the improvement of people's pursuit of things. Through the comparison of the two kinds of bearings, the characteristics of the cross Roller Bearing can be highlighted. Because traditional common bearings are more complex and assembled for more time, the emergence of cross roller bearings improves this problem. The structure of cross roller bearings is relatively simple, which simplifies many troublesome processes and improves labor efficiency.