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An ETC system based on RFID technology uses radio wave to identify cars passing through the toll collection site and automatically debits toll rate from the car owner's pre-paid account. RFID technology and its application in highway ETC system is analyzed in this paper. SNMP is a kind of protocol that has been widely used in network management system for many years. Because of its easy use and strong expansibility, SNMP is suitable for network management of ETC system. After introducing the basic knowledge of SNMP, this paper studies how to use SNMP to manage the RFID readers and the toll collection workstations remotely.