Abstract: With the rapid development of urban rail transit, operation and maintenance is faced with growing pressure. The platform architecture and main functionality of urban rail transit intelligent operation and maintenance system based on cloud platform are introduced. Taking the actual practice in Qingdao Metro for reference, the efficacy of the intelligent operation and maintenance system is summarized. The system can deal with massive equipment monitoring data, and the operation and maintenance staff can flexibly expand its computing and storage capacity according to current and future needs.