The technical trend of building the enterprise common electric power grid geographic information system（GIS） platform has broken through the traditional architecture of developing applications directly based on the GIS platform. A new common GIS platform centered architecture of electric power grid GIS applications is proposed to suit the technical development need. According to an in-depth analysis of GIS application requirements of the electric power grid enterprise， the concept of designing position-sensitive， grid-sensitive and application-neutral GIS platform is proposed. Four type GIS applications are summarized and an integration solution is proposed to optimize the data distribution and functional collaboration between GIS platform and GIS applications including some typical application scenarios. This architecture has been applied inSG186” project of State Grid Corporation of China and can take full advantage of the function of the key position and basic support of the common electric power grid GIS platform and ensure the data consistency of position， equipment， and topology of the electric power grid.