A slope has complex failure mechanism

and its stability is affected by many factors such as geological and engineering factors. Therefore

more attentions are paid to study of slope stability. A catastrophe model basing on the catastrophe theory and fuzzy mathematics is used to analyze and evaluate the slope stability; and a new comprehensive evaluation index of slope stability is proposed: catastrophe progression. This index considers synthetically effect of many factors on slope stability and reflects actually state of slope system. The study results of engineering cases show that this comprehensive evaluation method of slope stability based on catastrophe progression method has higher accuracy and good application to slope stability analysis.