On the basis of the method of numerical heat transfer,the surface temperature of target was simulated. Then, the influence of the performance parameters of camouflage coating(shortwave absorptivity αs、longwave absorptivity αl、emissivity εt) on the surface temperature of target was analyzed. Finally, the influence of these performance parameters on the lock-on range of infrared detection system was also analyzed. The analytical results show that all of performance parameters would affect the temperature of target. αs and αl are in direct proportion to the temperature of target, and εt is in inverse proportion to that, the influencing range could reach to 10 ℃.Moreover,the lock-on range of detection system correlates to background temperature, weather condition, capability of detector and so on, and adjusting the performance parameters to the practical condition can shorten the lock-on range to least. These results can satisfy the practical requirements of design, selection and application of infrared camouflage coating.