Abstract: 2D code based data transmission system is designed to implement automatic data transmission between classified information systems.A data communication procedure was proposed in this paper.The transfer data is segmented into multi-frames according to the 2D code data capacity in the sending side.The frames are used to generate a 2D code image sequence which is then sampled by a camera or some other vision sampling devices in the receiving side.The sampled 2D code images are decoded to recover the transfer data and the transferring result is feedback to the sending side.Comparing with the existing solutions such as manually interactive and safe-hinge equipment,the proposed 2D code based data transmission system solves the major drawbacks like low level of automation,low transferring efficiency and highly cost devices.Besides,the system implements an automatic and efficient data transmission in a network isolation environment,so that it can be used in the information interaction with high demand of time efficiency in classified information system.

Key words: 2D code, Classified system, Data transmission, Information interactive