We apply the number of attributes to the attributes reduction so that thet the spatial-temporal complexity of the NARIIS is less than that of the reduction strategy based discernibility matrix.

• 提出的约简算法把属性值的个数应用到属性约简上，使该约简算法的时间和空间复杂度都远小于基于区分矩阵的约简策略。