Abstract: This paper from the large minimg group information status quo, information technology application requirements, performance requirements, economic and other aspects, analyses the wide-area office building of the network needs. According to the demand, the paper makes the choice of widearea office of special network link type, the network structure, large widearea office of the Group's core network nodes, clustering node, access node for planning and design, depicting a widearea office of special network application scenarios.