In order to overcome the deficiency or defect of wire transmission and avoid damaging the measurement equip-ment because of frequent pluging and drawing,the infrared data transmission system based on USB2.0are designed in the paper.The overall structure and design and implementation of key hardware are described in detail,and the design of firmware,driver program and application program are also expatiated.It utilizes USB2.0technology and infrared transmis-sion technology to realize the wireless data transmit between measurement equipment and PC.