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in order to be able to make the power system to ensure the availability and reliability of the communication service, and to reduce the project cost, it designed the electric power communication SDH transmission network system architecture. Firstly, the problems in the transmission technology of power communication system are analyzed, and then the advantages of SDH transmission technology are expounded. Analyzed the SDH optical network topology structure, thus optimize the electric power communication SDH transmission network architecture, including telecommunication network equipment, network architecture, network cable lines, etc., which can make the communication network security, and effectively improve the capacity of communication according to the specific scheme optimization and implementation. Through optimizing design and transformation, the safety and stability of power transmission network have been improved effectively.