Communication networks in Smart Substation carry the sampling value and the protection trip signal, and the Ethernet Switch is the key to the reliable transmission of information. Information modeling is the premise of managing Ethernet switches as an IED. Firstly, the IEC61850 communication system architecture and the IED function and service modeling steps are introduced. On the basis of analyzing Ethernet switches function in smart substations, the information model of Ethernet switches is researched, focusing on the logical node class model of the logical node zero, port management, traffic statistics and alarm management. Secondly, the service model of Ethernet switches and communication service mapping are discussed, and the example of switches with substation configuration description language (SCL) is demonstrated. Finally, an application instance of Ethernet switches with information model in smart substation is given.