Wide-area power system reliability research contained within the substation and transformer substation network communication between the wide area communication network reliability research. Substation is the basic component of power wan system based on the substation building local area network is a point in the power wan system, is composed of a number of such points through the trunk communication network constitutes the wide-area communication network of electric power system. Substation communication network must meet the requirements of reliability and real-time performance. Anti-destroying ability, survivability and effectiveness is the basic measure of network reliability research. Anti-destroying ability and survivability study mainly from the perspective of network topology, effectiveness in their part on the basis of considering the demand of business performance, from the perspective of network availability, the reliability of the entire network measure are given.