Space specific targets such as infrared decoys are one of the main means to combat infrared detection. With the development of two-color guidance technology, the infrared detection sensitivity is continuously improved and the target recognition ability is continuously enhanced, which puts forward requirements for the fidelity of dual band infrared radiation on the surface of specific space targets. In this paper, the surface emissivity of space specific target is controlled, and the infrared radiation intensity is calculated by numerical simulation, so the regulation method of infrared radiation characteristics of space specific target surface is proposed. In addition, appropriate surface materials and thermal power application methods are selected according to the determined surface emissivity, visible light absorption and infrared emission ratio and internal heat source power, so as to ensure the surface mechanical properties of the specific space target and make the specific space target meet the requirements of dual band infrared radiation characteristics in the light and shadow area, and carry out the model making and thermal vacuum experiment, in which way the accuracy of theoretical calculation is proved.