Abstract:traditional method for geometric parameters of rock mass structural plane is using geological compass and straightedge scene, but this method has such problems as low efficiency, big difficulty, in order to effectively solve the problem, this paper introduced 3d laser scanning technology to obtain the geometric parameters of rock mass structural plane, greatly improves the efficiency of obtaining geometric parameters of rock mass structural plane. In order to verify the effectiveness of the proposed technique, choose a domestic mining slope to get point cloud data which will be preprocessed by the mean of denoising and hole repairing method, then use the method of structural plane recognition and grouping to quickly extract the rock mass structural plane and statistical structure information such as the orientation, obliquity, trace length, it will provides effective structural plane geometric parameters to slope stability calculation.