Introduce realization of the evaluation index used for the combat capability of the flight formation. Firstly, determine the weight of the factors by using the method of Analytic Hierarchy Process (AHP), then using the grey evaluation theory to construct the evaluation model of the combat efficiency. The procedure includes:determining the index system of the flight formation's combat efficiency, using AHP to ensure the factor weight of every factor set, establishing the evaluation sample matrix, determining the evaluation gray classifications, calculating the weight vector of the grey evaluation, finally, calculating the evaluation results.