Object′s surface Bidirectional Reflectance Distribution Function(BRDF)was studied,the wavelength factor was introduced on the basis of anisotropic Gaussian model,the modified Anisotropic Gaussian calculation model of BRDF with was put forward.The BRDF of satellite′s solar panel and multilayer insulation was calculated by using this model.The numerical results indicate that the modified model has univocal parameters and high efficiency,which can calculate object′s surface BRDF effectively.