As a high performance -cost ratio equipment, IR screen is widely used in ground IR countermeasure field. But in air-to-air countermeasure aspect, it is difficult to interfere IR missile effectively with IR screen because of the impact of high speed airflow. The system including target war-craft, IR screen, IR missile is founded. The launching occasion, the original velocity, the orientation of IR screen and the target maneuver are combined together. According to the principle of relative movement, the accurate positioning of IR screen is realized and the launch method of the smoke bomb is obtained. By making full use of IR screen's shade effect, target's elusion trace is received, based which the target's control law is worked out, thereby target's elusion method is obtained. By this way, the influence of high speed airflow on IR screen is eliminated and a method of airborne IR screen interfering in IR missile is found. The simulation of the complex system including target, IR screen and missile shows that the interfering method is feasible, which offers a reference to the design of IR interfering system and the establishment of IR interfering tactic.