In order to solve the less bay number support and poor performance of the outdoor installation busbar protection, a distributed design method based on MapReduce architecture is introduced, based on HSR ring network distributed busbar protection. The protection sub-machine is divided into the scheduling node and the task node, and the differential protection module of busbar protection is allocated some nodes to compute and merge according to the number of sub-machine, then the backup protection related to each sub-machine is assigned to the corresponding sub-machine and some redundant computing sub-machines, this design completes the busbar protection distributed computation and logical judgement, and the protection trip uses the "action three take two" logic. Through RTDS dynamic test, this design is proved high reliability and improves the available resources and performance of the busbar protection.