危岩体多位于陡峭的山坡上。被裂缝分开的块石有的规模很大，有的只是陡坡上的 一块孤石。采用传统测量方法不易得到危岩体的规模和不利结构面结合的特征。因此危岩体的失稳模式和 危险性预测一直是调查危岩体地质灾害的难题。三维激光扫描技术是近年来发展起来的一门新技术，凭借 其快速、精确和无接触测量等优势，它已被应用于不同领域。结合实例将三维激光扫描技术用于扫描危岩体。结果 表明，三维激光扫描技术可以很好地完成危岩体测量，其无接触测量的优势很好地解决了传统测量带来的 弊端。

Unstable rocks may often locate on steep slopes. Some stones separated by cracks are very large in volume and some stones are just boulders on steep slopes. Because the volume and unfavorable structure surface binding characteristics of a certain dangerous rock body can not be obtained easily by traditional measurement methods, prediction of the instability mode and dangerousness of dangerous rocks has been a challenge for the investigation of geological hazard to be caused by dangerous rock bodies. 3D laser scanning technology is a new technology developed in recent years. Because of the advantages of fast, accurate and non-contact measurement, it has been used in various fields. Some examples of using a 3D laser scanning technology to scan dangerous rock bodies are presented. The results show that the technology can perform well in the measurement of dangerous rock bodies and can overcome the shortcomings of traditional measurement methods.