Abstract: Aiming at the characteristics of beyond-the-horizon air combat where the main weapon is intermediate-long-range air-to-air missiles,a new threat assessment method is presented.The method extends and improves the non-parameter model in existence for calculating air combat threat assessment.Superiority functions such as azimuth,enter angle,distance,altitude and velocity are constructed based on the capability parameters of the fire control system and weapon system in each side.So the geometry situation superiority is educed.Then the air combat superiority is educed by synthesizing situation superiority,air combat efficiency superiority and tactical event superiority.The rationality and effectiveness are verified by an application example.