Abstract: Network security grade evaluation is the key of information system grade protection,to evaluate the grade of network security,it is necessary to establish an index system according to the national or industrial standards of network security grade protection,set index weights,and select an appropriate model for comprehensive evaluation.Based on the analytic hierarchy process and rough set theory,the index is comprehensively weighted,which overcomes the subjectivity of index weight setting and the burst of sample data.The correlation degree of the number series and the target sequence is measured by the grey correlation degree,and the coincidence degree between the actual network security level and the evaluation standard is more reflected.The example shows that the proposed method can effectively evaluate the network security grade.

Key words: Comprehensive weighting, Analytic hierarchy process, Rough set, Grey relational analysis, Network security grade evaluation