Abstract: To achieve good performance in the service area, a new design of shaped multi-beam antenna is presented in this paper. The inconsistency between the side lobe and beam width is resolved by shaping the surface of the reflector. In the optimization course, the distortions of the surface are set as variables, and then the real-coded genetic algorithm is used to get good performances. In the end, a simulation is performed to illustrate the efficiency of the method.