The non-contact IC card and the card reader perform read and write operations by radio waves. The communication frequency between the two is 13.56 MHz. The non-contact IC card itself is a passive card. When the reader reads and writes the card, the signal sent by the reader is composed of two parts: one part is the power signal, and the signal is received by the card, and the The L/C generates an instantaneous energy to supply the chip. The other part is the command and data signals. The command chip completes the reading, modification, and storage of the data, and returns a signal to the reader to complete a read and write operation. The reader is generally composed of a single-chip microcomputer, a dedicated intelligent module and an antenna, and is equipped with a communication interface with a PC, a print port, an I/O port, etc., so as to be applied to different fields.