Abstract: Information security is becoming more and more complicated with the tide of the times，so scientific and reasonable risk assessment provides a fundamental and effective solving ways for risk assessment.This paper uses the method of reliability analysis，puts forward a risk assessment model based on related vulnerability in the computer cyberspace，which is a new thought to the research of system attack modeling.

摘要： 信息安全问题随着时代的变迁日益复杂，而科学、合理的风险评估为信息安全提供了一种比较根本、有效的解决途径。运用可靠性分析的方法，提出了在计算机网络空间下，基于相关性漏洞的风险评估模型，对系统的攻击建模的研究提供了一个新的思路。