On the basis of the defects of grey evaluation, combined the analytic hierarchy process (AHP) with grey evaluation model of the aerial defense power of naval ships based on AHP is established, and basic procedures of the model is described. Make use of the principle of AHP, carry on the layer decomposition to the target, ascertain target by qualitative analysis. Taking the aerial defense power of warship as example, introduce the application of the model. The result shows that the method is rational and it can reduce the influence of subjective factor and improve the accuracy of the evaluation conclusion. It provides an efficiency method for improving the air defense ability of naval ship.