Abstract: Based on full life cycle cost analysis theory, taking Suzhou Rail Transit Line 1 as an example, the cost categorization and composition at each stage of urban rail transit full life cycle is studied. By summarizing and analyzing data from past years, considering maintenance strategy of equipment at each stage, the operation and maintenance cost of each specialty of Line 1 during operation is analyzed, and the maintenance cost of Line 1 in full life cycle is predicted. Relevant data can be used as decisionmaking reference for urban rail transit enterprises value increase, cost decrease and efficiency improvement, and sustainable operation strategy exploration.