Evaluation and prediction of landslide susceptibility degree are the primary task of landslide disaster prevention. Therefore

evaluation of landslide susceptibility degree is very important in a scientific and reasonable method. According to the special geological conditions of the dam site of Yansangshu hydropower station

the nine influencing factors are selected

including weathering degree

slope and so on. And then landslide susceptibility classification standards are established; the landslide susceptibility rank is divided into mild

moderate

severe and extremely severe. Catastrophe theory is used to evaluate the landslide susceptibility degree; and a new comprehensive evaluation model of landslide susceptibility is proposed. Landslide susceptibility degree evaluation method based on catastrophe theory considers the correlation between every evaluation index; in which the internal mechanism of landslide system is described truly. The results of cases studies show that this proposed method has higher accuracy and good application to landslide prevention.