IGA　(Improved　Genetic　Algorithm),　a　new　genetic　algorithm,　is　proposed.　With　five　additional　steps　which　are　hybrid　selection　operator,　competition　among　brothers,　greedy　operation,　filter　operation,　and　dynamic　supply　new　individuals,　IGA　can　improve　global　convergence　property　and　convergence　speed.　The　experimental　results　show　IGA　has　great　advantage　over　many　existing　genetic　algorithms.