As mentioned above, the open CNC system has better versatility, flexibility, adaptability and expansibility. The United States, the European Community and Japan have implemented strategic development plans one after another. Dongguan CNC plant has carried out the research and formulation of open architecture CNC system specifications (OMAC, OSACA, osec), The world's three largest economies have made almost the same scientific plans and specifications in a short period of time. Dongguan CNC plant indicates the coming of a new era of change in CNC technology. In 2000, China began to study and formulate the specification framework of China's onc CNC system.