The distributed fault-tolerant computer technology of deterministic communication takes the needs of a new generation of IVMS as background in this paper, the system architecture design and software architecture of distributed fault-tolerant computer are studied, and one kind of communication software based on VxWorks653 partition operating system is designed and implemented, moreover, it has been practically applied in engineering, and it can meet the communication needs of big data and high-performance in avionics applications after function and performance verification. This communication protocol software is implemented with layered architecture, which is conducive to cross-platform migration, software reuse, and subsequent hardware upgrades.