Abstract: High grade CNC system is related to industrial security and national security. In order to further break through the development of China′s national defense technology, the patent application and layout of major enterprises and research institutions in the field of CNC at home and abroad were analyzed based on Thomson data analyzer (TDA) patent data analysis tool. The results showed that the number of NC technology related patents has increased explosively since 2006 from a global perspective. China, Japan, the United States and Germany are the main output places of NC machine tool patents, and the patent output of the four countries exceeds 85% of the total patents. However, compared with other three countries, the international competitiveness of China′s patented technology is weak, and the technical strength of Chinese enterprises has obvious disadvantages. In addition, China′s universities and scientific research institutes have strong knowledge and technology output capacity, but they have not been truly transformed into industrial achievements. In the future, it is necessary to strengthen industry university cooperation and improve the transformation capacity of technology industry.