Abstract: In order to deal with new operational concepts such as distributed warfare, mosaic warfare and all-domain warfare, reduce the complexity and uncertainty of multi-platform avionics system, and solve the problems of multi-platform avionics system architecture design and flexible construction, based on the modular system development method, a modular oriented multi-platform avionics system architecture design method is proposed to standardize the modular representation of the system architecture. On this basis, the modular oriented multi-platform avionics system organization and application mode is proposed to provide support for flexible generation and dynamic construction of the systematic schemes.