In order to apply CAN bus to the Remote Power Distribution Unit (RPDU) system of domestically-produced large aircraft,an improved application scheme of CAN bus is designed.According to the particularity of the RPDU system of domestically-produced large aircraft,the appropriate network topology and communication rate are selected.The structure of CAN identifiers and data domain is reasonably divided,and the format of converting CAN message into ARINC664 message is defined.Then,the communication module of satellite RPDU and gateway RPDU is designed,in which the availability and integrity of CAN communication are improved based on ARINC825 protocol,and the communication scheduling mechanism of ARINC825 is improved based on TTCAN protocol to ensure the certainty of CAN communication.The experimental results verify that the proposed scheme meets the design requirements and is feasible.