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With the development of avionics technology, the avionics system of civil aviation airliner is developing towards digitization and complication, so the reliability of communication between equipments is required to be higher. After analyzing the standard of ARINC825 bus protocol, designing a low-cost dual-link redundancy ARINC825 communication interface with STM32F207 single chip computer and commercial CAN controller. The reliability of the communication interface is analyzed by using time-triggered bus scheduling technology. The experimental results show that the ARINC825 protocol communication interface scheme has high reliability and can satisfy the communication requirements of airplane cockpit control.