曲线养护中,曲线测量点的布置及计划正矢的计算一般采用查表法。而在实际工作中探索出来的倒弦法和长弦取中法,只要记住原有的几个简单公式就可以全部解决问题。本文着重探讨了这三种方法的利弊,介绍后两种方法的操作。 Curve conservation, the measurement point of the layout and the planning of positive vector calculation generally use the look-up table. In the actual work to explore out of the method of stringing and long strings to take the law, as long as the original remember a few simple formulas can all solve the problem. This article focuses on the pros and cons of these three methods, describes the operation of the latter two methods.