To analyze the seasonal camouflage requirements of the coating average emissivity at 8~14 μm waveband and the thickness of phase change material (PCM) layer, with the investigation on solar radiation, the vegetative cover′s temperature and the air temperature in one day, a temperature model of target that display the changing of its radiation temperature in one day of different seasons is built. The thickness of the PCM layer and the coating emissivity are changed to obtain the the target radiation temperature. The camouflage efficiency is calculated with different PCM layer thickness and coating emissivity, taking the camouflage efficiency and actual application into account, when PCM layer’s thickness reaches 1.5 mm, the result is suitable. In this condition, in order to obtain the best camouflage efficiency in the daytime, the coating emissivity should reach 0.5, 0.3, and 0.4 respectively in spring, summer and autumn. To obtain the best camouflage efficiency of the night and whole day, the coating emissivity should reach 0.9, 0.8 and 0.9 respectively.