Based on substitution of the indiscernibility relation by a dominance relation and a confident threshold value a set , an extension of the rough sets model is proposed , which can deal with possible inconsistencies in preferential multiple attribute decision tables and obtain preferential probabilistic decision rules made up of preference actions 摘要通过用优势关系代替不可分辨关系,并设定置信阈值,提出了一种可以从偏好多属性决策表中发现偏好概率规则集的扩展粗糙集模型。