In view of the problem that the urban rail transportation network information security evaluation method is difficult to measure, this article analyzes the characteristics of urban rail transit information network system and the networked operation, proposes the six sigma based evaluation method from accident analysis, and establishes measurement index to make quantitative analysis for security evaluation, so as to provide basis for urban rail transportation network information security evaluation.%根据城市轨道交通网络信息安全评估方法难以衡量的问题，分析城市轨道交通信息网络的系统和网络化运营的特点，提出从事故分析出发的基于六西格玛理论的评估方法，并构建衡量指标使其安全评估进行量化分析。从而为城市轨道交通网络信息安全评估提供基础。
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