An airborne video and communication bus processing system is designed based on APU+FPGA for several widely-used airborne communication buses in current avionics system.With APU main processor and the programmable logic device FPGA as the core, one channel of input ARINC818 video is superimposed with the internally generated characters, and the function of outputting one channel of ARINC818 video to the display is realized.At the same time, it can support 7-way RS-422 and 4-way ARINC429 bus communication.In addition, the 22-way input discrete data and 7-way input analog data are processed.The system adopts the low-power, high-performance and highly-integrated APU and FPGA as the core processor, which greatly simplifies the hardware architecture, reduces the power consumption of the system, and improves the reliability.The design has been successfully applied to the display control management system of a certain aircraft.