Abstract: Danxia landform is an area with high incidence of geological disasters in China. The exposed near-horizontal red sandstone and conglomerate steep cliffs are the most important identification elements. Under the internal and external dynamic action of geological structure, including chemical dissolution, physical weathering, gravity and biology, the rock mass of steep cliff is often extremely broken, and the disaster of dangerous rock collapse and slide is particularly prominent, the deformation mode is complex, the destructive power is strong, and because of the complex slope structure, the engineering investigation is difficult. So, with a deformation dangerous rock mountain scenic area as an example, this paper proposes a high-location and steep broken should based on the technology of unmanned aerial vehicle to the exploration of supergene field quickly identify methods for joint, and the accurate grasp the dangerous rock mass on the surface of the control structure on the basis of the spatial distribution characteristics of breakage of dangerous rock is established in Danxia landform high three-dimensional random fracture network model.It is expected to provide theoretical guidance for the stability evaluation and prevention of dangerous rock in the region.