Abstract:Distribution network is an important component of the electric power communication network, has been due to a lack of suitable network solutions, become electric power communication network vulnerabilities and the bottleneck of restricting the smart grid application in distribution side. Article first introduces the concept and features of distribution network, this paper introduces the importance of distribution network automation in power grid, communication technology for distribution network automation system of the importance of key technologies in power grid. Through several mainstream communication technologies, which are used in the current distribution network were studied, analysis the advantages and disadvantages and economic and technical comparison, choose the economic and reasonable distribution network networking technology and construction scheme. It is proved that in the application of engineering construction, most of the automatic communication systems of distribution network adopt the networking mode of optical fiber communication, wireless communication or transmission line carrier. Therefore, the communication system design, power distribution automation system should weigh the pros and cons of various solutions to the choice of the ways of communication, then according to the characteristics of the power distribution automation system in power distribution network structure and specific design. Only in this way can we build a stable and reliable automatic communication system of distribution network and lay a good foundation for automation of distribution network.