为提高城市轨道交通的建设管理水平，引用了WBS（work breakdown structure，工作分解结构）理念，通过对城市轨道交通建设活动的水平分解和其技术系统的垂直分解，形成了比WBS树状图更完整、更有价值的WBS矩阵；在阐明界面和WBS矩阵概念的基础上，分析如何运用WBS矩阵以提高城市轨道交通建设管理的界面管理水平；采用对比分析法对WBS矩阵的组成、结构系统、原则以及WBS矩阵实施效率的影响因素进行了具体的分析。

To improve construction management in the urban rail-transit, the WBS concept is well exploited by crossing a horizontal breakdown of urban rail-transit construction activities with a vertical breakdown of its technology system, thus a WBS matrix is obtained, which is more complete and useful than the WBS tree. This article firstly stated the concepts of interface and WBS matrix, with urban rail-transit analysis of how to use WBS matrix to improve interface management. The composition, structure system and principle of WBS matrix were specifically analyzed by contrastive method. The handling efficiency of WBS concept was decided by the changing of the factors.