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This paper discusses the classification problems of text documents. Based onthe concept of the proximity degree, the set of words is partitioned into some equivalence classes.Particularly, the concepts of the semantic field and association degree are given in this paper.Based on the above concepts, this paper presents a fuzzy classification approach for documentcategorization. Furthermore, applying the concept of the entropy of information, the approachesto select key words from the set of words covering the classification of documents and to constructthe hierarchical structure of key words are obtained.