Abstract: The shaped reflector for a low-orbital earth resource satellite is synthesized using geometrical optics in this paper. The secondary radiation patterns of the reflector are calculated based on physical optics technique, and the reflectors is optimized for obtaining the earth-matched beam. Two different boundary conditions are offered in synthesis of the reflector, and the corresponding calculated results are given and compared with each other. The effect of the blockage of feed on the secondary radiation pattern is studied. The calculated results agree well with the tested results.