NFC is a wireless connection technology that provides easy, safe and fast communication. Compared with RFID, NFC has the characteristics of short distance, high bandwidth and low energy consumption. NFC is compatible with the existing contactless smart card technology and has become a formal standard supported by more and more major manufacturers. Thirdly, NFC is also a close-range connection protocol, which provides easy, safe, fast and automatic communication between various devices. Compared with other connection modes in the wireless world, NFC is a close and private communication mode. NFC plays a huge role in access control, public transportation, mobile payment and other fields.