Abstract: Huanglongtan reservoir area in Du River basin is one of the important water sources for the South-to-North Water Diversion Project, and it belongs to highly prone, dangerous and risky geological disaster area. At present, the combination of macro monitoring, group monitoring and prevention, professional monitoring and "four in one" grid management are used for geological disaster monitoring and early warning. Due to the serious insufficiency of monitoring methods, there is an objective demand for the use of comprehensive remote sensing technology to build a "space-aerial-ground" three-dimensional geological disaster monitoring network. Aiming at the short board of geological disaster monitoring in Huanglongtan reservoir area, the authors divided the area into three monitoring levels, including general area, key area and major geological disaster area, based on analysis of the development law of geological disasters in this area. The optical remote sensing interpretation and interferometric synthetic aperture radar (InSAR) were arranged in the general area. The light laser detection and ranging (LiDAR) was added to the key area monitoring. The unmanned aerial vehide photogrammetry and ground three-dimensional laser scanning monitoring were added to the major geological disaster area monitoring. At the same time, the hidden dangers of geological disasters in the identified deformation area were checked in time. By the early identification, monitoring and early warning of geological disasters integrated with "space-aerial-ground" network, the disaster prevention capacity requirements in rural revitalization, geological environment protection and water security were met. The research has reference significance for the construction of "point and surface control" type geological disaster monitoring and early warning system in mountainous areas.