通过对逐点比较法插补原理的分析 ,指出了该方法逼近程度不均的缺陷 ,提出了一种改进的插补方法———最小偏差路径法 ,给出了双曲线插补的计算公式和实现方法。该方法具有插补精度高、在微型机上易于实现 ,运行平稳、可靠等优点。 By analyzing the interpolation principle of point-by-point comparison method, this paper points out the defect of the method’s uneven approximation, and proposes an improved interpolation method --- minimum deviation path method. The formula of hyperbolic interpolation is given And method of realization. The method has the advantages of high interpolation accuracy, easy implementation on a miniature machine, stable and reliable operation, and the like.