加工精度的检验是虚拟制造中NC图形验证技术的一项重要研究内容。本文从复杂曲面的离散表达、扫描体的生成以及直线与曲面的求交计算 3个方面对基于曲面离散技术的加工精度检验方法的研究现状作了一个较为全面的论述 ,指出了其中存在的不足 ,给出了相应的解决方法 The test of machining accuracy is an important research content of NC graphics verification technology in virtual manufacturing. In this paper, a comprehensive study is made on the research status of the machining accuracy testing method based on surface discrete technology from the discrete expression of complex surface, the generation of scan body and the intersection calculation of straight line and curved surface. The existing problems are pointed out , Gives the corresponding solution