Abstract: Taking the operation and maintenance of Shanghai metro power supply system as background,combined with the application experience of SCADA system in metro power supply system,power intelligent operation and maintenance system（PIOMS） is developed and applied. The system structure and functionality of PIOMS are introduced,and the relationship between PIOMS and SCADA is analyzed. Results show that the deep integration between PIOMS and SCADA can mutually promote the upgrade of metro power supply system intelligent operation and maintenance. PIOMS provides a new solution for ensuring safe operation and maintenance of urban rail transit hyperscale network power supply system.