Abstract: This paper aims to systematically and comprehensively extract relevant geological information from UAV aerial photography data and ensure that it can better assist in geological survey work. It introduces the method of geologic overall analysis and information acquisition of geological points, boundary, plane, objects based on photos and DEM made by UAV. At the same time, it forms a set of technical methods for assisting geological survey with UAV. It verifies the feasibility and efficiency of UAV in geological survey work through practical application in geological survey of landslide disaster. The study has certain guiding significance for effective acquisition of comprehensive and systematic geological data based on UAV aerial geological mapping and geological compre￣hensive survey.