In the matter of geological hazards,Pengyang County is in extraordinarily severe situation in Ningxia Autonomous Region.Through the analysis of the data of regional geological environment,a detailed investigation of geological hazards in Pengyang County is completed by means of remote sensing interpretation and ground investigation,in the manner of the combination of point,line,and area surveying.Results from the investigation show that landslide,collapse,and unstable slope are the main types of geological hazards in the county,with the typical characteristics of geological hazards in loess region.They present zonal and concentrated features in view of temporal and spatial distribution.Landscape,stratum structure,rainfall,and human engineering activity are considered as the main formation conditions of geological hazards.