Along with the economical development, construction project toward large and comprehensive. Composed by multiple substation is more common in the electrical system, the whole electrical system management and maintenance is particularly important.Previous substation mostly is independent operation and Independent management, It's not the development trend.At the same time, substation management system that based on integrated power technology and network technology in recent years obtained the strong development.This paper introduces the background of substation integrated management system, study the substation integrated management system composition and structure, and combined with the actual engineering analysis substation integrated management system, application points and key.