Electric spindle is a new technology that has emerged in the field of machine tools in recent years, integrating machine tool spindles with spindle motors. It is widely used in CNC machine tools. It, together with linear motor technology and high-speed cutting tool technology, will push high-speed machining into a new era. Unfortunately, as one of the important components of CNC machine tools, the localization rate of electric spindles is very low. Currently, 60% of the electric spindles used in CNC machine tools need to be imported. Experts point out that the localization of electric spindles is not difficult technically, so it is necessary to increase its development. If the domestication rate of electric spindles is not increased, relying solely on imports will not only waste more foreign exchange, but also constrain the self satisfaction rate of China's CNC machine tools