Abstract: Taking the slope of Kongxigou Zinc Mining Area in Beiba of Nanzheng County as the research object, 3D laser scanner was selected to collect the slope deformation data, and the deformation monitoring data were analyzed and processed, so as to study the slope deformation of the mining area. Aiming at the problems often encountered in the process of data processing, such as point cloud data splicing, point cloud filtering, point cloud simplification and model reconstruction, this paper put forward some methods for reference. In addition, a polygon segmentation method was proposed to divide the focus area of the model into several polygons, and the horizontal and vertical displacement of the slope was analyzed according to the change of the coordinates of the polygon center of gravity. The results show that the analysis results of deformation monitoring data are consistent with the actual changes.