粗糙集理论是一种建立在分类的基础上处理模糊和不确定知识的数学工具,正越来越被人们所关注。首先介绍了格值信息系统的相关知识,并以偏序关系为基础得到了一种新的关系:优势关系,给出了约简和核心,简化了概念的分类特征,也给出了上近似、下近似及约简的判定定理和辨识矩阵的概念,最后通过具体的例子说明这种约简方法是有效的。 Rough set theory is a kind of mathematical tool that deals with fuzzy and uncertain knowledge on the basis of classification and is getting more and more attention. Firstly, the related knowledge of grid information system is introduced and a new relationship based on partial ordering relationship is obtained: the dominant relation, the reduction and the core are given, the classification characteristics of the concept are simplified, and the upper approximation , Lower approximation and reduction judgment theorem and the concept of identification matrix. Finally, through concrete examples, it is proved that this reduction method is effective.