According to three-dimensional (3D) reconstruction theory, based on multi-angle images of the target, 3D points cloud of the target surface is reconstructed. With the method of Delaunay triangulation and the principle of “visibility”, the target surface and the normal vector of surface elements are gained. By the rough surface scattering theory and the target sample bidirectional reflectance distribution function (BRDF), associated with the spectral radiance of the background at some time and place calculated by Modtran, the spectral scattering radiance distribution of the target is obtained by numerical analysis method. Taking a car covered with car sewing as an example, the error of the reconstructed geometric 3D model is 4.11%, and the spectral scattering radiance distributions of the target in three bands are obtained by numerical calculation. The method above can be applied to the research on spectral radiation and scattering of satellites and other spatial targets.