Abstract: Objective: To achieve rapid information sharing of DC traction power supply system, as well as improving reliability of the system and enhancing the interoperability between devices, a crosssubstation networking protection scheme for DC traction power supply system based on GOOSE (generic object oriented substation event) communication is proposed, building upon the conventional approaches. Method: Based on a fiberoptic pointtopoint interlayer networking model, considering system reliability and engineering application convenience, the GOOSE communication technology is employed to replace conventional hardwired connections for the transmission of protection intertripping and interlocking information between substations. Result & Conclusion: Compared to conventional approaches, this scheme extends the functionality of networking protection in DC interval while ensuring the preservation of existing protection features. Test results demonstrate that this scheme achieves reliable protection interlocking and intertripping, featuring higher reliability. It provides a new choice for crosssubstation information transmission in DC traction power supply system.