强化恢复系是获得强优杂交稻新组合必不可少的条件，在不育系相同而恢复系不同的情况下，所配组合杂种优势的强弱、综合性状的好坏、产量水平的高低，都直接受到恢复系的制约。我国在税三系恢复系的选育方面，主要是采取测交筛选和杂交选育的方法，育成的恢复系中，以明恢63最 Intensification of restorer lines is the essential condition to obtain new combinations of high yielding and good quality hybrid rice. Under the condition of the same sterile line and different restorer lines, the strength and weakness of combined heterosis, the quality of synthesized characters, the level of yield, Restricted directly by the restoration department. China’s tax system of three departments of the Department of Breeding, the main method is to take the test selection and crossbreeding breeding, bred in the restore system, Minghui 63