Aiming at CAN bus technology in aerospace field, this article proposes a new FlexRay bus communication mod. It introduces a processing mod based on FPGA + FlexRay architecture, and describes the characteristics and working principle of FlexRay bus. It analyzes the feasibility of the application of FlexRay bus in the aerospace field from communication protocol, and expoundes the application of FlexRay bus in the aerospace field of our country from the aspects of chip selection, principle design, interface realization and software design.