Abstract: The figures of merit (FOM) is an important parameter describing the positioning service performance of ground-based augmentation system (GBAS). Its airworthiness compliance means that the parameter meets the corresponding airworthiness standards. Based on the relevant standards of the Radio Technical Commission for Aeronautics (RTCA), the meaning and calculation process of FOM are deeply analyzed and studied. On this basis, combined with the technical standards order of China Civil Aviation GBAS airworthiness, the method, principle and process of airworthiness compliance verification of this parameter are given. And in accordance with the corresponding dynamic environment and the flight data collected by X-Plane, the FOM of Class A airborne GBAS receiver is simulated for compliance verification. The simulation results and data statistics and analysis show that the FOM of Class A receiver meets the airworthiness requirements and is consistent with the airworthiness standards of the Class A receiver related to the FOM, which proves the correctness of the given airworthiness compliance verification theory and method of figures of merit. The research results can provide corresponding theoretical and methodological support for the airworthiness certification of Chinese airborne GBAS receivers.