数控系统中经常会用到样条插值，对于不封闭曲线，一般的样条插值，就能解决，但对于封闭曲线，首尾控制点的处理不当，传统的增加控制点的方法经常会出现不平滑，甚至锐角，本文就应用埃尔米特插值解决这一问题，并在Visual C++上进行仿真实现。-CNC systems are often used in spline interpolation, for non-closed curve, the general spline interpolation, can be solved, but for closed curves, head and tail control point was mishandled, the traditional method of increasing control points are often that there is no smooth, or even an acute angle, this paper on the application of Hermite interpolation to solve this problem, and in Visual C++ on Simulation.