According to the characteristics of IEEE1394B bus, a high-speed serial bus, the application of SAE AS5643 protocol in the key field of aviation safety is analyzed.The technical characteristics of the protocol is studied, and the deterministic aspects are expounded, such as time synchronization, data communication, root node, topology and bandwidth.Based on the advantages of time trigger, the AS5643 protocol is improved, the functions such as time trigger scheduling and sending and receiving time are improved, and a time trigger scheduling design architecture based on AS5643 protocol is put forward, so as to further improve the robustness and certainty required for the application of aviation safety critical systems in future high-speed (1.6 Gibit/s, 3.2 Gibit/s, etc.) communication applications.RTL-level implementation and simulation analysis of the design scheme are conducted, which verify the correctness of the communication.