In order to solve the compatibility problem of 1394b optical fibre bus’s application in military vehicle, the 1394b’s interface was realized which was based on 1394b’s asynchronous transmission mode and used FPGA as center processor. The connection between RS232 and 1394b was designed to test the system, which accomplished the compatibility of 1394b and general bus protocol. Analysis shows that the design can accelerate 1394b’s applications.