Abstract: With the increasing of dispatching service, the risk of message congestion or loss due to bandwidth limitation of dual-machine in one group has gradually exposed. In order to solve the problems, the technology of multiple dispatching machines in one group has been presented. Multiple dispatching mechanism of one group means to set several dispatching desks including two or more different dispatching machines in the same group, so as to realize information sharing within the group and multi-level redundant backup of the dispatching system. This paper analyzes its similarities and differences with dual-machine in one group, studies the design and implementation principle of multiple-machine in one dispatching group from the hardware architecture, logic architecture and functional protocol, and analyzes practical cases applied in power dispatching system of State Grid. By putting forward the application of multiple-machine in one group in power dispatching and production business, feasible suggestions for the integration of power business are provided.