Aiming at the problems such as unreasonable weight distribution in traditional air to ground operational capability evaluation index model, discuss the operational capability evaluation of close air support for fixed-wing aircraft. According to the combining modern close air support emphasis on the characteristics of fast, continuous, accurate, analytic hierarchy process (AHP) is adopted to establish the close air support operational capability evaluation index system, and then establish the air support operational capability evaluation comprehensive index model based on traditional air to ground operational capability evaluation index model. Then, take multi-use fighter aircraft example to analyze and verify the model is effective. The research has some practical reference value.