Abstract: In order to meet the requirements of power communication networks for complexity and high reliability, this paper designs a grid communication architecture based on Software Defined Networking(SDN). First, this paper analyzes the basic structure of SDN and its core role in centralized control and network optimization. Secondly, it constructs a layered architecture suitable for power communication scenarios. At the same time, this paper studies a routing strategy that comprehensively considers constraints such as link bandwidth and node load to minimize latency. Finally, this paper deeply analyzes the characteristics and advantages of this architecture in order to provide important support for the informatization and intelligent development of power systems.