Abstract: The fast fault self-healing technology of distribution network automation mostly depends on optical cable medium communication. In some projects, the full coverage of optical cable can not be implemented because it is very difficult to excavate the optical cable laying path in some sections. To solve this problem, a hybrid peer-to-peer communication technology based on optical fiber and medium voltage carrier is proposed. 10 kV power line is used as communication medium in the difficult laying section of optical cable. The feasibility of peer-to-peer carrier communication is analyzed from three aspects of peer-to-peer communication mechanism, communication structure and data communication priority. Taking powernetwork of single ring as the application object, the application scheme of communication configuration is described in the whole line. The distribution network faults can be isolated by using this communication schemeeffectively.