Abstract: In order to study the applicability of airborne LiDAR technology in mountainous terrain measurement. DJLTerra was used to study the terrain of the Pengshui Hydropower Station reservoir area in the Wujiang River Basin. The airborne LiDAR point cloud data filtered and denoised by Terraoil and other software were compared with traditional measurement data for error analysis. The penetration, planar accuracy, and elevation accuracy of the airborne LiDAR were analyzed. The research results indicated that the mean square error of the planar position coordinates of the airborne LiDAR point cloud data was 0.021, with a maximum error of 0.034. The mean square error of the elevation was 0.008 m, with a maximum error of 0.021, which could meet the measurement specifications for 1 ∶500 mountainous hilly terrain maps. The airborne LiDAR had a high precision and penetration ability, and was suitable for complex terrain areas such as steep mountains, houses crisscrossing horizontally and vertically, and dense trees. Compared to traditional measurement methods, the airborne LiDAR technology was safer, more reliable, and faster.