关键词: 实数粗糙集 , 区间数 , 信息决策系统 , 广义重要度 , 属性约简

Abstract: Through the real rough set model based on consistent relation， the conceptions of the lower and upper approximation，boundary，B －positive region，B －negative，and B －borderline region were analyzed．Then attribute reduction
in real value rough set was presented，and the steps of attribute reduction were given．Successive search generalized important degree of subset，to see whether the generalized important degree is equal to that of the set．The feasibility is proved by the following example．

Key words: Real rough set , Interval number , Information decision system ,  Generalized importance degree , Attribute reduction