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In this paper, we present a novel network security evaluation method framework, with a comprehensive analysis of the MADM (Multiple Attribute Decision Making) theory. This framework constructs a measurement model of network security, and normalizes the measurement process. It also provides specific evaluation methods to satisfying the practical requirements. Thereinafter, an example of network worm propagation evaluation is illustrated. Compared to existing evaluation methods, our methods are more comprehensive and scientific, and can make the rank preference order of each worm life cycle stage of each worm defense strategy. Our approach makes contribution on the standardization and scientific of the network security evaluation process.