Abstract: Affected by Longmenshan fault tectonic zone and the post-earthquake effect of “5.12” mega earthquake, the geological environment of Beichuan County is of unusual complexity and fragility, and the geological disasters occurred frequently in this area during the flood season. On the basis of the investigation of the disaster-pregnancy geological conditions in the wild, the authors collected geological disasters data and summarized the overall characteristics of the development and distribution of geological disasters in this region. Based on GIS, the authors analyzed disaster-pregnancy geological conditions of collapse and landslide, and studied the correlation between geological disasters and topographic conditions (elevation, height difference, slope, plane and profile curvature, relief, gully density, distance from water system), stratigraphic and lithological conditions (engineering geological rock group), geological structural conditions (fault), post-earthquake effects (seismic intensity), slope structure and human engineering activities (distance from road). The results show that geological structure, land use type, slope structure, slope and profile curvature are the most important geological conditions for landslide development, and the advantageous interval for the landslides development in each disaster-pregnancy condition is given. The collapse is controlled by the engineering geological rock group, distance from water system and seismic intensity. Considering the main disaster-pregnancy conditions in Beichuan County, the county can be divided into five major disaster-pregnancy geological conditions zones. And disaster-pregnancy characteristics and development laws of each area were described in detail. The further understanding of disaster-pregnancy geological conditions of collapse and landslide in Beichuan County can improve the local disaster prevention and mitigation system, and provide some references for other geological disaster risk investigation and evaluation projects.