This paper introduces the conception and research method of LCA.Based on the analysis of situation of urban traffic system,LCA is tried to be applied to selection on Urban Traffic Mode.

• 介绍了LCA(生命周期评价法)的概念和研究方法，并在分析当前城市交通系统现状的基础上，将LCA思想初步应用与城市交通方式选择。