Abstract digital substation is the development direction of the electric power industry in the past period of time, because of the lack of unified communications Guarantee, the development of digital substation by certain constraints, in recent years, the number of working together to promote new technologies, the digital substation communications solution program has been considerable development, this digital substation based on IEC61850, communication key technology for its research on the hierarchical network of data exchange standards, digital substation mode were analyzed.