关键词: 粗糙集, 信息熵, 离散化, 约简, 故障诊断

Abstract: This paper analyzes particularity of the rough set theory in processing questions，gives a new method of continuous attributes discretization on the basis of the existing findings，and the method will be applied to fault diagnosis.The experimental results show the decision rules have better classification effect in fault diagnosis，which are constructed by this algorithm.

Key words: rough set, information entropy, discretization, reduce, fault diagnosis