Abstract: The differential features can support Internet of Things existing as a new kind of development, and the theory model can indicate that Internet of Things has been understood deeply. A semantic analysis pointed out that the thing in word Internet of things indicates actually the thing's information, and the Internet is actually the Internet application.Internet of Things is a new type of Internet application which makes the thing's information be shared on a global scale. Internet of Things has four differential features; only for thing's information, coded by UID or EPC, stored in RFID electronic tag, uploaded by non-contact reading with RFID reader. The graphical model of Internet of Things shows that the main tasks of constructing Internet of things are the preprocessing of thing's information before uploaded into Internet and the building of an RFID system. The set expression model of Internet of Things stresses the common character of Internet applications namely an Internet application is essentially a set of information, so the development processes and the technical methods of other Internet applications can be referenced and reused.

Key words: Internet of things, Internet application, Thing's information, RFID