Abstract: The development, communication standards, system structures, operating principles of airborne multiplex data bus and its sphere of application are discussed in this paper. A method using a microcomputer to design the intelligent terminal and bus controller of the system is described with emphasis on hardware and software design.The major problems about high speed, real-time and secure transmission of data between computer and its interface are reviewed. The intelligent terminal and bus controller have been developed by means of 8086 computer. An experimental prototype has been made and its job programs debugged.The optical fiber data bus system consists of optical receivers, optical transmitters, an optical couple with eight ports, the bus controller and the intelligent terminal. Some of checkout tests have been completed at code rate of 1 Mbit/s with this system.The optic fiber transmission system are also considered and some experimental results are given.