本文提出了一种新的参数曲面线投影求交计算方法。该方法基于参数域摄动原理，将求交问题转化为一系列筒单的参数摄动、映射、判断、比较等运算，能有效地解决参数曲面的线投影求交计算，并已在复杂曲面测量造型和数控加工质量分析中取得了良好的应用效果。 In this paper, a new method for calculating the intersection of parameters and curved line projection is proposed. Based on the principle of parametric domain perturbation, the method transforms the intersection problem into a series of simple parameter perturbation, mapping, judging, comparing and other operations, which can effectively solve the intersection of line projection and intersection calculation of the parameter surface, Measurement modeling and CNC machining quality analysis has achieved good results.