根据Kubelka－Munk模型和Mie散射理论，解出了涂覆在高发射率衬底上的红外涂层里的辐射传输方程(RTE)，建立了涂层在热红外(8～14μm)波段的发射率的计算模型．在运用铝粉粒子作为颜料粒子的情况下，根据计算结果，得出了涂层发射率与粒子半径、涂层厚度的关系，以及最优的粒子半径范围．

By using of Kubelka-Munk theory,Mie theory and independent scattering approximation,the radiative transfer equation (RTE) was resolved in a infrared coating attached to a highly emissive substrate,and established the computation model of the emittance of the coating in the thermal infrared band(8～14μm). Taking aluminum particles with spherical shape as the pigments,according to the computation results,it' s given the dependence of coating emittance with respect to particle radius,thickness of coating. We proposed the optimum particle radius range of the pigment particles as well.