Abstract: Power communication network is used to transmit various control signals of power production, which is an indispensable carrier to ensure the safe and stable operation of power grids. This paper studies the networking structure, service configuration modes and development trend of power backbone transmission network carrying communication services. Firstly, the hierarchical network structure and service survivability scheme of power transmission network are discussed. Then, the channel configuration modes of synchronous digital hierarchy transmission network carrying relay protection services for different voltage transmission lines, dispatching data network, dispatching switching network and other services are analyzed in detail. The reliability of service channels under different modes are also discussed. Finally, we prospect the development trend of power backbone transmission network and present beneficial suggestions.