In view of the problems of traditional bus protection, such as low reliability and difficulty in operation and maintenance, by comparing the characteristics of distributed bus protection with host and the protection without host, a solution of distributed local bus protection with host based on redundant ring network communication is proposed. A sampling synchronization method using host internal clock as synchronization source is studied and an identity topology location technology for distributed system is proposed, which can achieve the protection function independent of the external clock and the free configuration and plug and play. Finally, the applicability of IEC 61850-9-2 and GOOSE frame format message is analyzed according to the size of data flow in distributed bus protection ring network, a new communication frame format is proposed which can meet the requirements of bandwidth and transmission delay in using 100 M port. The feasibility of the technical scheme is verified by the pilot running in substation. This work is supported by Science and Technology Project of the Headquarter of State Grid Corporation of China (No. 521104180017) “Research on Outdoor Protection Construction Scheme and Key Technologies”.