CNC technology is advancing rapidly, from the dynamic numerical control technology and equipment development in the world, high-speed high-precision, intelligent, flexible, high-reliability, green, open, network control is the development of numerical control technologytrend. Architecture CNC system is an open system structure based on the PC digital development; in terms of network functions, numerical control systems and CAD / CAM integration, as well as CNC machine tools, network monitoring, maintenance and management have a good development prospects; in intelligent control, according to the processing conditions for automatic correction of the processing parameters, regulation and compensation has become a reality; tends to high-speed high-speed, high-precision control of CNC machining accuracy of quality of the products is also growing high. Conducive to the importance of improving the level of information of China's manufacturing industry and international competitiveness. CNC technology has undergone a fundamental change, is the very rapid development in recent years, applications of a comprehensive high-tech, it is to meet the processing and the emergence of high-precision, high-speed, complex parts, is automated, digital , flexible, information-based, integrated network based on the soul and core of the modern machine tools and equipment, has a wide range of applications and potential applications. Keywords: CNC high speed and precision; composite of CNC intelligent, open, networked, flexible high-reliability, green and functional; the STEP-NC open CNC system.