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中文摘要：
本文针对决策系统给出了一种新的知识粒度模型，并给出了知识粒度下的核属性定义和分析了知识粒度模型的属性约简与正区域模型的属性约简的等价性．在此基础上利用知识粒度的重要性作为启发式信息构造了决策系统的属性约简算法．算法能够快速获取决策系统的属性约简，算例分析进一步说明了算法的可靠性．
英文摘要：
In this paper, new measurement method for granularity knowledge model based on decision--making system, and it is proved that attribute reduction based on granularity knowledge model is equivalent to that based on positive region model in decision-- making system, and then attribute reduction algorithm of decision-- making system based on knowledge granularity is proposed, the algorithm quickly calculates attribute reduction in decision-- making system, the example also show that the algorithm is effective and reliable.
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