Abstract: With the development of Internet of things technology, the security of Internet of things has been attracted extensive attention.As one of the key technologies of the Internet of things, theRFID (radio frequency Identification) is facing a serious security threat. In this paper, the structure of the Internet of things and the composition and working principle ofRFID system are discussed first.And then we analyze the security problems in the aspects of data security, integrity, availability and authenticity of RFID system. Finally, the concrete precautions are summarized from two aspects of the physical measures and the authentication protocol.

Key words: Internet of Things, RFIDsystem, potential safety hazard, precautions