摘要： 概率风险分析被广泛应用于社会各领域，如交通、能源、化工处理、航天、军事等。文章采用概率风险分析的方法，对网络的逻辑构成、网络攻击和攻击结果进行分析，通过故障树描述了网络系统被攻击的原因与途径，并建立了风险评估模型。

关键词: 概率风险分析；网络安全；风险评估；漏洞；威胁

Abstract: Probabilistic risk analysis (PRA) is currently being widely applied to many sectors, including transport, energy, chemical processing, aerospace, and military. A method of PRA is used to analyze the fundamental reasons why network systems are vulnerable to attacks. After making a study on network composition and different types of system vulnerabilities, a model of information security risk assessment is proposed.

Key words: Probabilistic risk analysis (PRA); Network security; Risk assessment; Vulnerability; Threat