Simulation of infrared countermeasure is important to evaluate the jamming effects of infrared decoy, the anti-jamming capability and jamming strategies of infrared-guided missiles, and the tactics and combat plan of air combat. The accuracy of the simulation model has an important impact on the effectiveness and accuracy of the simulation system evaluation. The infrared countermeasure simulation system, infrared decoys and infrared-guided missile models at home and abroad are introduced, which provide some thoughts for the related researches of infrared countermeasures simulation system.