Electronic product tag (EPC tag) is composed of electronic chip and soft antenna smaller than rice grain 1/5. Electronic tags are as thin as paper and can be made to be the size of stamps or smaller. EPC tags can be detected by readers at a distance of 1-6 meters. Electronic tags can generally read and write information. Electronic tag is a mature technology. EPC electronic tags are characterized by global uniform standards and are very cheap. EPC electronic tag has the characteristics of unified standard, greatly reduced price and interoperability with Internet information, and has been widely used. In 2006, the global application of electronic tags will reach 60-80 billion pieces per year.