This paper presents a protection setting management system based on the power dispatch data network. Theprotection setting is transmitted across the section based on XML and sent from the dispatch center of sectionⅢ to thesubstation of sectionⅡ by the network security segregation unit， solving the problem of issuance at long last. By using thetechnology of irreversible encryption and digital signature， the system security and stability has been greatly improved and theneed of actual application fairly well met by accomplishing automatic network flow of the protection setting for the modernpower system.