Abstract: The modeling method of ultraviolet scattering characteristics for space satellites was studied according to background radiation environment. The target surface was divided into regions and each region was divided into grids in view of surface material characteristics and appearance respectively. The bidirectional reflection distribution function (BRDF) model was introduced to describe light scattering properties of target surface grid based on radiation theory, and a mathematical model of ultraviolet scattering properties of the target was built by superimposing scattering components of all the surface grids. The optical dynamic characteristics of the target on its orbit was achieved by using its given physical dimension and parameters. The solar sail irradiance obtained from the entrance pupil of the detector at a certain observation angle is approximately equal to that from the target body, and the maximum magnitude is 10-11W/m2. The simulation results indicate the solar sail can not be neglected when the target characteristics is analyzed.