The intelligent status detection, fault diagnosis and self repairing of Computer Numerical Control (CNC) machine tool feeding system can improve the stability and reliability of CNC machine tools, and reduce the CNC machine tool processing problems. As an important part of CNC machine tool feed system, the ball screws precision and performance directly affects the machining quality of CNC machine, and the development of intelligent ball screw has a great influence on the development of intelligent CNC machine. It was summarized of the current status of research on intelligent analysis of ball screw, and the differences and advantages and shortcomings in its static and dynamic measurement. Summarized application of fault diagnosis technology in ball screw based on both mathematical model and artificial intelligence (AI). Spring flow lubrication mechanism of ball screw and self repairing method by lubricant and additives were illustrated. The status detection and fault diagnosis of ball screw technology and self repairing technology of existing problems are explained, and pointed out the intelligent development direction of ball screw.