目前玉米育种上，应用最广泛，最富有成效的育种方法还是杂交育种。在育种过程中不但要进行杂交，而且还要进行自交，必要时还要进行回交，杂交育种就是综合运用杂交、自交和回交等技术手段来进行新品种选育的，是一项综合的技术系统。由于育种的目标不同，所采取的杂交、自交 At present corn breeding, the most widely used, the most productive breeding method is hybrid breeding. In breeding process not only to carry out hybridization, but also self-self, if necessary, but also backcross, hybrid breeding is the comprehensive use of hybridization, self-back and backcross and other technical means to carry out selection of new varieties is a Integrated technology system. Due to the different goals of breeding, the hybrids are taken and selfed