The way of graphic intersecting points to input the geometric shape of component is adopted by this system to replace the inputting way of traditional used programing language. A visual, easy and reliable method is provided for NC programing of the complex component. 系统采用图形交互的方式输入零件的几何形状,取代了传统的使用编程语言的输入方式,为复杂零件的数控编程提供了一种直观、简便、可靠的方法。