The key in life cycle design of urban mass transit is the special design and overall optimization by employing the life cycle theory and method. At the same time, it is necessary to integrate comprehensively all elements to a-chieve the life cycle optimization of urban mass transit. The object system consists of functional economic object, engineering-environment object and engineering sustainable development object. On the basis of engineering breakdown structure and object breakdown structure, the flow of urban mass transit life cycle design is established. The final design is to harmonize and integrate the results of sub-object design proposal and sub-engineering system design proposal, this theory has been applied in a subway engineering project.%城市轨道交通全寿命周期设计的核心,是运用全寿命周期的理论和方法进行专项设计和整体优化,将全部设计要素综合集成,以实现城市轨道交通全寿命周期的整体最优.其目标体系以功能-经济目标、工程－环境目标和工程可持续发展目标为核心.构建了城市轨道交通全寿命周期设计的流程.城市轨道交通的全寿命周期设计以工程系统分解结构和目标分解结构为基础,通过子目标设计方案和子工程系统设计方案之间的整体优化和协调集成形成城市轨道交通全寿命周期设计方案.该设计理论已在某地铁工程中得到了应用.
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