Aiming at the problem that the workload of switch VLAN configuration and multicast is large and prone to error,a scheme of exchanging the switch configuration information based on the SCD file is proposed to realize the automatic configuration of the switch.Based on establishing switch model and physical connection model of substation,this scheme analyzes the inherent association between the virtual connection and physical topology connection and makes use of database's function to match out switch's configuration information,then output the configuration as CSD file.Downloading the CSD files into switch can complete switch's unified off-line configuration consequently reducing switch's configure and maintenance difficulty.It is proved that this method can reduce field configure work and is of great significance in engineering application.