Firstly, the status, function, challenges of airborne radars in modern wars are presented and the infrared signatures of all parts of an airborne radar are further analyzed. Secondly, how the airborne radar confront the point-type infrared missile is studied emphatically. Finally, the relationship of the launch time of an infrared decoy with its sustained time in two different launch ways is obtained. This can provide the theoretical basis for the airborne radar to confront the point-type infrared missile.