The current assessment methods focus on single facility and ignore influences between facilities , so a method of quantitative assessment with domino effect analysis and RBI ( risk-based inspection technology ) was pro-posed to assess facilities risks of gas transmission station .Firstly, the inherent risk of the facility was obtained with failure probability and hazard index calculated .Then, the risk of domino effect was ascertained .At last, the total risk of facility was calculated .Example analysis verified that the risk of single facility in gas transmission increases significantly when taking domino effect risk into account .%针对目前输气站场设备风险评价方法仅以单个设备为评价对象，并未考虑设备间相互影响的特点，提出将多米诺效应分析引入输气站场设备风险评价当中，再结合RBI （基于风险检测方法）对输气站场设备进行定量风险评价。首先，计算所评价设备的失效概率与危险指数，得到设备固有风险；然后对设备的多米诺效应风险进行计算；最后，得到设备总风险。实例分析表明，考虑多米诺效应风险后，站场单个设备的风险要明显增大。
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