生命线灾害的经济损失分为财产损失、救灾费用和效益损失；每种经济损失又分为企业经济损失和社会经济损失．文章提出了交通运输生命线灾害社会效益损失的计算方法，给出了灾害造成的运输费用和运输时间增加等15个项目的计算内容和计算公式；计算中分别考虑了正常运输量、外部转移运输量、内部分流运输量、诱发运输量等损失变化所造成的社会经济效益损失． Lifeline disaster economic losses are divided into property damage, disaster relief costs and benefits of loss; each economic loss is divided into economic losses and social economic losses. This paper puts forward the calculation method of social benefit loss of traffic lifeline disasters, and gives the calculation contents and calculation formulas of 15 projects such as transportation cost and transportation time caused by disasters. In the calculation, the normal traffic volume, external transfer traffic volume , The internal diversion of traffic, induced traffic and other losses caused by the loss of social and economic benefits.