To develop the interpolation function of simple CNC system,facilitate the CNC programming,based on DDA circular interpolation and used Visual C++6.0,circular interpolation was realized on PC.

• 为了拓宽简易CNC数控系统的插补功能；使数控编程更加灵活；依据数字积分法(DDA)圆弧插补原理；使用VC6.；0在个人计算机上实现了圆弧插补。