杂交水稻系统选育新品种．其理论基础是基因的自由组合。该选育方法有三个特点：一是由于杂交稻亲本都是经过严格测配筛选．多具有较强的一般配合力和特殊配合力．中选目标机率高；二是层出不穷的杂交稻组合用于生产．为选择稳定的水稻品系提供了丰富的杂交后代材料；三是它不用单独杂交配组．选择方法简便可行。 Hybrid Rice System Breeding New Varieties. Its theoretical basis is the free combination of genes. The breeding method has three characteristics: First, hybrid rice parents are strictly tested by screening. More with a strong general combining ability and special combining ability. High probability of winning the election target; Second, an endless stream of hybrid rice combinations for the production. For the selection of stable rice lines provide a wealth of hybrid progeny materials; Third, it does not need to be a single hybridization group. The selection method is simple and feasible.