Abstract:Taking Kushui Town as an object, the types, geological condition, development and temporal and spatial distribution of geological hazards were systematically analyzed, fully utilizing the preexisting data and field investigation. Both landslides and unstable slopes with a band distribution along the first ramp region of the east loess hilly areas belong to soil slopes and have obvious rainy season effect. Based on the geological condition of Kushui Town, using the slope as a basic unit, the slides and unstable slopes were evaluated and divided by susceptibility taking different index respectively, of which the results were used for further division and evaluation by risk. The results show that according to susceptibility the geological hazards in Kushui Town can be divided into four zones: high susceptibility zone, medium susceptibility zone, low susceptibility zone and no susceptibility zone with areas of 0.16km2, 0.01km2, 0.03km2 and 1.37km2, respectively. Instead according to risk, the geological hazards can be divided into four zones: high risk zone, medium risk zone, low risk zone and no risk zone with areas of 0.118km2, 0.035km2, 0.031km2 and 1.386km2, respectively. The division by susceptibility and risk are fit with the field investigation, and can better reflect the overall development characteristics of geological hazards in this area, which has guiding significance for geological hazard prediction and early warning in Kushui Town and provides a reference for geological hazard prevention of urban areas in Gansu.