At present, the domestic bus technology is being developed based on the open cnc system and the exchange of servo-driven system of standards, all the major domestic manufacturers CNC Are stepping up research and development of NC-based bus technology systems and AC servo drive system and has made key technical breakthrough. NC machine tool manufacturing equipment is the "Machine Tools", the NC system, servo-driven system and the NC machine tool servo motor is the brain and the limbs, CNC machine tools is the core of key components. NC current technological development is the main characteristics of high-precision processing and high-speed multi-channel multi-axis control, all kinds of intelligent automatic programming, remote diagnosis, adaptive control, high-speed Fieldbus network and open architecture, and so on. At present, China is studying and formulating a new CNC system standard STEP-NC, the NC technology for the development of the manufacturing sector as a whole, will have far-reaching implications. In recent years China's rapid development of NC technology, product quality and performance has been greatly improved, China CNC servo drive system and the exchange of basic low-end occupation of the NC machine tool market, in the high-grade numerical control system R & D and application has also made certain achievements. But in the high-end CNC machine tool market, or foreign-branded products represent a significant advantage. The development of high-grade cnc system is our established policy, but at present the developed countries on imports of high-grade numerical control system in China is still the embargo imposed restrictions, so these The latest high-grade numerical control technology is also impossible to buy from abroad, and only rely on our own efforts for independent innovation, overcome these technical fortress. The rapid development of computer technology, embedded technology, network technology and rich resources of software, numerical control technology to the development of China provided a good opportunity to enable us to a higher starting point in the development of high-grade numerical control system. Based on the open bus system and the exchange of CNC servo drive system is urgently needed breakthrough in key technologies. Industrial Ethernet's rapid development and make breakthroughs in key technology areas of industrial automation control systems are gradually unified communications network to industrial Ethernet, and are speeding up application development as a technology trend. At present, the domestic bus technology is being developed based on the open numerical control system and the exchange of servo-driven system of standards, all major domestic numerical control system manufacturers are stepping up research and development based on bus technology cnc system and the AC servo drive system and has made key technical breakthrough.