Infrared smoking screen is an effective way to confront the infrared imaging anti-ship missile, for researching on the theory of the smoke screen confronting the infrared imaging anti-ship missile, the motion models of the warship, screen smoke and missile are given, the judgement method of the smoke＇s interfere effectiveness is discussed from the point of SNR of missile influenced by smoking screen＇s thickness,the infrared smoking screen confronting the infrared imaging anti-ship missile is dynamically simulated and the principle and the means of the arrangement about the smoke and elusion of the warship are derived from simulation, the simulation conclusions are of great value to the tactics use of the screen smoke confronting the infrared imaging guided missile.