Abstract: A design method based on the interface module of airborne flight control computers, which could realize digital control, real-time acquisition, monitoring and processing of various control signals (including discrete magnitude, analog quantity and serial data), was introduced. Focusing on the engineering application, the design idea and implementation methodology of the module were elaborated, as well as the self-tesing, with the illustration of principle block diagrams and testing process. In the application of a certain air freighter, the module performed the functions of the input and output of 32 interfaces discrete magnitude, the input and output of 16 interfaces analog quantity, the transceiving of 6 interfaces ARINC 429 serial data, and the transceiving of 4 interfaces ARINC 232 serial data, with the coverage of self-testing reaching 100%. The flexibility of the form and the number of the module interface enables the adjustment in accordance with the actual application; therefore the module is featured with evident typicality and generality, which can be used in various types of airborne flight control systems.