Abstract: This paper applies non-contact acquisition techniques and 3D fracture network modelling to study the discontinuities of high-steep slope located in Miansi Town, Wenchuan County. UAV, 3D laser scanning, and Close Range Photogrammetry are used to generate 3D DEM model and to recognize and interpret discontinuities. Especially, UAV and Close Range Photogrammetry are applied to recognize and interpret controlling large discontinuities and 6663 stochastic structural fractures. Based on the collected data, this paper propose a 3D fracture network modelling method that fits for large sampling windows of high-steep slopes. Stochastic mathematics and spatial geometric derivation methods are used to determine the diameter, orientation, and density of 3D fractures. This method is much easier and to the point, as well as has a higher accuracy according to field verification.