Abstract: Genetic algorithms(GAs) are characterized by its simplicity.It doesnt require the function continuity,the existence of derivative,and the single-peak.And it can converge to global optimal solution.In this paper,GAs are employed to find the discrete bar areas for minimizing normal deviation from the best-fit-paraboloid(BFP) of antenna structures.The results of examples indicate that the near optimal solutions can be obtained for the problem of complex structure optimization by GAs,and it is of high efficiency and good adaptability.