Radio frequency tags are the physical carriers of product electronic codes (EPCs) attached to trackable items that can be circulated around the world and identified and read and written. In recent years, RFID (Radio Frequency Identification) technology has drawn people's attention as the key technology for building "Internet of Things". Early originated in the United Kingdom, RFID technology used in the Second World War to distinguish between enemy and aircraft identity, commercial began in the 1960s. RFID technology is an automatic identification technology, the United States Department of Defense regulations after January 1, 2005, all military supplies are required to use RFID tags; the United States Food and Drug Administration (FDA) recommended that drug makers use RFID tracking since 2006 Fake medicines. Walmart, Metro retail applications RFID technology and a series of actions is to promote the application of RFID in the world craze. In 2000, the price per RFID tag was $ 1. Many researchers think RFID tags are very expensive and can be applied on a large scale only at a reduced cost. In 2005, the price of each RFID tag is about 12 cents, and now the price of UHF RFID is about 10 cents. RFID to large-scale application, on the one hand is to reduce the price of RFID tags, on the other hand depends on the application of RFID can bring value-added services. Statistics from the European Union's Office of Statistics show that in 2010, 3% of companies in the EU applied RFID technology. Applications were distributed in identity documents and access control, supply chain and inventory tracking, car charging, anti-theft, production control and asset management.