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With the characteristic of complete fault redundancy and operation robustness in both time and space, ARNC659 bus has been gradually adopted by aerospace which has high requirement of communication certainty as well as fault silence and insulation. In order to make the ARINC659 bus can better adapt to the demand of highly redundant and distributed control in spacecraft integrated avionics, this paper achieves a bridging technology that can connect the ARINC659 bus among different devices, so as to achieve unified timing planning and communication scheduling of all hardware modules of distributed integrated avionics. This improves significantly the ability of avionics in resource sharing and parallel computing and fault tolerance, and also provides an approach to operate between modules within different devices of pivotal system with strict temporal relationship. Finally, the effect of bus bridging to bus synchronization are analyzed, and puts forward design constraints and implementation principle during design of bus bridging.