Threat assessment is an integral part in air combat. In order to accurately describe the threat degree of multiple targets, firstly, according to the threat indicator model, combined with the genetic algorithm and analytic hierarchy process (AHP), a GAAHP algorithm is adopted to establish the consistency indicator function through the threat judgment matrix, and the problem of solving the eigenvector is converted into the problem of solving the consistency ratio. Secondly, through adjusting the parameters of the algorithm and comparing with other methods, the optimal feature vector is selected according to the consistency ratio. Finally, based on the index threat function and taking the multi-target air combat environment of 2v4 as the background, the target threat value of each index is calculated, and the multi-target threat ranking is obtained according to the optimal eigenvector. The experiments show that the GAAHP algorithm can produce more optimized consistency index value and eigenvector, and accurately describe the threat degree of multiple targets.