Beijing is located in the northwest corner of the North China Plain, with a total area of 16410 km(2), of which mountainous area accounts for about 61.3 % of the total area. Due to the complex geological and geomorphological conditions, the development of fault structures, the spatial-temporal uneven distribution of rainfall and the influence of human engineering activities, there are many sudden geological hazards in Beijing, such as collapse, landslide, debris flow and mining collapse. As is known, Beijing is one of the capital cities with most developed sudden geological hazard in the world. With the continuous development of economy and tourism in mountainous and shallow mountain valleys and the further enhancement of human activities, the threat of sudden geological hazard to Beijing's social and economic development will continue to exist. This paper explores the application of digital twin technology in the survey and prevention of geological hazard in Beijing, mainly using tilt aerial photogrammetry, 3D model production, remote sensing interpretation, ground analysis, database management and other methods to carry out high precision survey, mapping and investigation research. Furthermore, we analyze the relevant features of geological hazard hidden danger points, deeply study their dangers, and establish a two-dimensional and three-dimensional information management system for geological hazard in Beijing's mountainous areas. It is proved that the information management system can effectively improve the management and prevention of geological hazard.
