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防空信息网络安全态势评估方法，是掌握网络安全态势调整安全策略的依据。在分析防空信息网络结构基础上，提出了“从下至上，先局部后整体”的评估思想，建立了计算服务安全态势、防御强度、主机安全态势、局域网安全态势和广域网安全态势模型；根据网络安全态势量化评估模型，分别研究了威胁程度、安全属性受安全措施影响程度、服务重要性权重、主机重要性权重和局域网重要性权重的确定方法。通过仿真实验表明，层次化网络安全态势量化评估方法，可以科学准确地反映防空信息网络安全态势，对调整网络安全策略以及保障信息网络安全具有一定的理论价值和现实意义。“,”According to the security evaluation model of air defense information network, the network security situation could be obtained, and the defense strategy would be adjusted. Based on the analysis of the air defense information network structure, the thought of ＂from down to up, and local to integer＂ was proposed, and the model of service, defense, host, LAN and WAN were set up. According to the quantitative security evaluation model, the threat degree, the affect of security measures to security attribute and the weight of service, host LAN were conformed. Then, it showed reasonable of the hierarchical quantitative security evaluation model for the air defense information network by the simulation, and it was meaningful to adjust the security measures and secure the information network from theory and reality.