The ground-attacking UAV has become an indispensable part of military operations,whose autonomy level will determine the upper limit of UAV operations.In view of the small data size of some of the evaluation indexes,on the basis of the established evaluation index system,the Gray Relational Analysis (GRA) method is used to calculate the gray relational degree between the comparison sequence and the reference sequence,whose weighted relational degree is then obtained by using the judgment matrix of Analytic Hierarchy Process (AHP), so that the autonomous capability of the ground-attacking UAV is evaluated.Three types of ground-attacking UAVs, namely,MQ-1 Predator,MQ-1C Gray Eagle and MQ-9B Guardian,are used to verify the autonomous capability evaluation system through simulation.The results show that the method can distinguish the level of autonomous capability of different types of ground-attacking UAVs,which has a guiding significance for the application of the quantitative model of autonomous capability evaluation to the large/medium-sized UAVs on active service.