We present a network security evaluation index reduction method based on rough set theory. An algorithm with rough set theory to mine the rules of computer network security evaluation is proposed. The evaluation rules mining method presented in this paper is validated with a simpliifed network security evaluation data set.%给出了基于粗糙集的网络安全评估指标的约简方法。提出了一种利用粗糙集理论提取网络安全评估规则，进而利用评估规则构建网络安全评估决策系统的算法。利用一个简化的网络安全评估数据集，验证了本文提出的决策规则提取方法是有效的。
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