Abstract: Precision ball screw pair as the “core key parts” of high-end equipment manufacturing industry, its processing and manufacturing accuracy directly affects the performance level of equipment. At present, the main manufacturing technology of thread processing is grinding technology, cyclone milling and so on. In this paper, the characteristics and application of cyclone hard milling technology are studied, and the temperature field distribution and thermal deformation law of ball screw in cyclone hard milling process are obtained by virtual simulation technology combined with field experiment. Whirl hard milling can realize high efficiency, green, environmental protection, low consumption and no pollution in the process of machining screw. It has important theoretical and application value to carry out in-depth research on whirl hard milling technology of precision ball screw.