钻孔摄像技术能够采集到大量地下岩体内的结构面数据，分析其数据有助于进一步揭示结构面的空间分布规律和组合关系。针对钻孔内获得的结构面几何参数的特殊性，提出了综合倾角、倾向和位置深度等参数的特征点描述方法，在局部坐标系下对结构面特征点的描述方法及计算过程进行了阐述，推导出了结构面几何参数与特征点坐标之间的转换公式，在全局坐标系下对特征点坐标进行了归一化处理，最后对空间坐标系下特征点的分布规律进行了探索。研究结果表明，（1）空间坐标系下的结构面特征点是结构面几何参数和空间位置的综合反映；（2）特征点在空间的分布反映了结构面的空间组合关系。为结构面的统计分析提供新的思路和方法，有助于开展结构面的空间分布规律和交切关系研究，对钻孔摄像技术的发展和以结构面几何特征为基础的岩体稳定性评价起到积极的推动作用。

A large number of underground rock discontinuity data can be collected by borehole camera technology. The in-depth analysis of these data will help to further reveal the spatial distribution regularities and geometrical relations of discontinuities. In view of the particularity of geometric parameters from discontinuities obtained in borehole, a new method called feature point which includes the angle, inclination and depth parameters is proposed. The paper mainly focuses on description and calculation process of feature point under the local and global coordinates. The conversion formula between the geometry parameters and feature point coordinates is derived. Distribution regulation of feature points under spatial coordinate system is discussed. The results show that: (1) The feature point is a comprehensive reflection of geometric parameters of discontinuity and spatial location. (2) The distribution of the feature points in space reflects the spatial association relationship of discontinuities. This study provides a new idea and analysis method for the statistical analysis of discontinuities; and helps to research on the discontinuities distribution regularity and intersection relationship, on the development of borehole camera technology and on the basis of the discontinuity geometry characteristics of rock mass stability evaluation with a positive role.