In order to research into quantitative risk assessment technique for multi-surface potential landslide, taking Xiayahe landslide which has four potential sliding surfaces in Weibin District, Baoji City, Shaanxi Province as an example, based on large scale(1:10000) field survey, geotechnical exploration, indoor analytic research and by using international single landslide risk calculation formula, fundamental characteristic and fatalness of Xiayahe landslide were briefly described and potential harmfulness, influence scope of every different potential sliding surface , time-spatial probability, vulnerability and risk were deeply researched.