To analyses the seasonal requirement of camouflage paint′s average emissivity in 8-14 μm waveband, after simulating the change of the solar radiation, the vegetative cover′s temperature and the air temperature in one day, a temperature model of target and vegetative cover that display the changing of their radiation temperature in one day of different seasons was built.Hefei as an example, represent four seasons′ climate by the weather conditions of spring equinox, summer solstice, autumnal equinox and winter solstice and collect Hefei′s climate data of these solar terms in recent five years.Imitated the radiation temperature of target that covered the camouflage paint with different average emissivity in 8-14 μm waveband and vegetative cover from 6 to 22 in these solar terms.The Euclid Distance and the camouflage efficiency were obtained by the radiation temperature data to analyze the camouflage effect.When the Euclid Distance is least the infrared characteristic of target is closest to the vegetative cover′s.In this condition, the emissivities in different seasons are 0.58, 0.33, 0.41 and 0.86.Radiation temperature difference between target and background within 4K is the standard to achieve stealth.Reference this standard, the target has the best camouflage efficiency in different seasons when the emissivities are 0.6, 0.3, 0.4 and 0.9.