Abstract: The architecture and construction method of urban rail transit energy management system based on cloud platform is expounded. The system deploys construction by taking advantage of the high efficiency and flexibility of cloud calculation. By adopting network\|station 2\|level management mode, the cost of server deployment and maintenance in network and line is reduced. By switching the internal business application of energy management system to SaaS on cloud platform, energy management system can access shared data on cloud platform, as well as saving data after business analysis, to benefit other business on the cloud platform, achieving logical synchronization and efficient usage of data resource.