The design method of the self-check on the aeronautic fire control automatic test system is researched in this paper. The design requirement of the test system self-check is given and the self-check design options and the design method of the hardware are introduced in detail. The applications of the self-check database and the hardware test panel make the test and fault diagnosis very flexible. The application indicates that this method improves the work efficiency and dependability of the self-check in the use and maintenance of the test system.