Camouflage coating plays an important role in the study of infrared stealth technology.Based on the infrared stealth mechanism,a new study orientation is put forward for the infrared camouflage coating technology with the judgment criterion of infrared stealth,in which the radiation contrast between target and background should be less than 0.02.Lock-on range of detector system was also used to check this criterion.The results show that it is not suitable to only reduce the emissivity of target when considering infrared stealth of target.On the basis of the radiation energy difference between the target and background,the camouflage coating with proper emissivity can be chosen for target by taking specific combat environment into consideration.It is also found that as the contrast diminishes to 0.02,the lock-on range reduces by 71.4%.