Taking No.8415 top-coal caving workface in Zhuxianzhuang mine as an example, the authors acquire the features of the example, established a fuzzy clustering model, and reach the correspondent clustering center and the weight group of all factors influencing various mechanic parameters, then study the mechanic properties of the end face of top-coal caving in soft coal by fuzzy clustering methods, finally put forward the principles of type design of support for top-coal caving based on the interaction of support and rock.