简要地回顾了玉米外杂选亚群的应用改良过程、相应的杂种优势模式及对玉米育种的贡献,分析了其应用中存在问题,并就如何改良应用进行了探讨。 This review briefly reviewed the application and improvement process of heterosexual subpopulations of maize, the corresponding heterosis patterns and their contributions to maize breeding. The problems in their application were analyzed and the application of them was discussed.