以Ｂｕｆｏｎ随机投针问题为原理，对线截抽样的概念作了系统的介绍，并在此基础上提出了以线截抽样为原理的线状物体的调查方法。在计算机上成功地模拟了路网调查，从模拟的几种方案可以得出：线截抽样完全适用路网调查，且以本文中的Ｂ、Ｃ两种方案为好，并可以以此推广到林网及防护带的调查。 Taking the Bufon random injection problem as principle, the concept of line cut sampling is systematically introduced. Based on this, a survey method of linear objects based on line cut sampling is proposed. In the computer simulation of the road network survey successfully, from the simulation of several programs can be drawn: line cut sampling is fully applicable road network survey, and in this article B, C two programs as well, and can be extended to Lin network and protective belt investigation.