Based on the GOOSE demand for the relay protection system in the digitized substation， the network latency is analyzed with respect to rapidity and methods for improvement are put forward. In connection with the reliability and security， the ways of redundancy and characteristics of the mode of switch assignment are analyzed， respectively. The method for rational design of the network scheme of the relay protection system according to the primary connection form and the characteristics of relay protection configuration is proposed. The GOOSE network schemes of typical connection forms are also demonstrated. Furthermore， the VLAN， priority and multicast filtering of switches should also be attended to in accordance with the primary connection form and the relay scheme.