Abstract: In this paper, distribution, material structure, formation, stability and characteristics of the large landslides in Chongqing city were analysed, while the risk evaluation model of oversize landslides was established, the probability and risk degree of oversize landslides were determined basing on typical oversize landslides. Combining with the risk evaluation results, risk management strategies and counter measures of prevention and mitigation were proposed according to the characteristics of oversize landslide disasters.