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Nowadays, many studies of the discovery of the relative pattern of a disease, but some of them do not consider the data privacy of patients completely, and others are not very effective to find the pattern. In this paper, we propose a novel approach to deal with the above problems. We employ intuitionistic fuzzy set, alpha-cuts, and Apriori algorithm to discovery the relative pattern of a disease under an anonymous way. The approach is expatiated by an example. And it has been applied in our cooperative hospital. The yielded pattern of a disease are meaningful. So the approach is provable and valuable.