关键词: 安全态势评估, 危害指数, 并行网络模拟, 安全事件

Abstract: When processing large-scale network security events，a network security situation evaluation system can be useful and help user to deal with these security events.This paper proposes an approach that computes network security disaster index and designs a security situation evaluation system for large scale network.Using replaying network security events，this system can evaluate network security situation，compute disaster index of whole network and give a policy of processing these security events.The results of experiment illustrate that this approach is effective for evaluating large scale network security situation.

Key words: security situation evaluation, disaster index, parallel/distributed network simulation, security events