中文摘要：

针对如何确定网络安全评估指标的问题，在AkNetFlow数据对象中提取关键域数据的基础上，将数据按相关维度进行多种形式的汇总分析，通过灰色关联优势分析的方法，计算网络安全事件与网络数据各种特征的灰色关联度，确定了体现网络安全事件的重点特征因素，提出了一系列评估网络安全的重点指标。实验结果表明，提取的指标能有效地反映网络的安全态势。

英文摘要：

Aiming to solve the problem of net safety evaluation index, the data extracted from NetFlow are analyzed. And the data are aggregated by several relational dimensions. Using the method of grey relation advantage analysis, the grey relation values of network safety affairs and the characters of the data are calculated. The pivot characters representing the affairs were decided. Then a set of network safety evaluation indices are proposed. The experiment results show that the indices can reflect the network situation efficiently.