Recently, artificial infrared temptation (tracer bullet) countermeasure is an important efficient countermeasure skill. Therefore the infrared guided missiles must have a property of CCM-infrared jam. Some basic characteristics of infrared jam have been discussed in this paper, that is spectral phenomenology for infrared jam, radiant intensity ratio of target/infrared jam, altitude effect and velocity effect of infrared jam, etc. Those results which have been obtained by a great number of experiments have applicable value in practice. Finally, a brief introduction about infrared guided missile simulation technique and necessary jam-module approaches in infrared-jam countermeasure has been stated for evaluating CCM-infrared jam capability.