Device network management method for power system

The invention relates to a device network management method for a power system, solving the technical problem of high traffic overhead. According to the method, a multi-mode terminal is controlled bya power service terminal, a router is controlled by a power service main station, and the multi-mode terminal and the router establish PPTP connections through a virtual private network (VPN), whereinPPTP connections comprise a PPTP control connection and a PPTP data connection, the PPTP data connection comprises steps of defining preset parameters and calculating an optimal package length L according to some preset parameters so as to enable the power service terminal and the multi-mode terminal to transmit IP data according to an actual package length L1; PPTP control connections are builtbetween the multi-mode terminal and a network control device as well as between the router and the network control device; the multi-mode terminal sends a heartbeat package to the network control device and the power service ma