In order to study the applicability of oblique photography in the field of damming hazard, the model construction principles of oblique photography were introduced, and the key steps of UAV oblique photography were expounded. Based on the POS data and image data collected by the UAV, image screening, air triangulation calculation, point cloud dense reconstruction and point cloud triangulation were carried out to complete the 3D digital model reconstruction, and the terrain of the Baige damming area is displayed in the form of digital elevation model, digital surface model and orthoimage. The morphology of the Baige dam is also measured. The results show that UAV oblique photography can well adapt to the complex environment of the damming site, and has the ability to access the target area quickly and complete the mapping task efficiently.