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长期以来，采用提纯复壮生产玉米自交系，存在许多弊端。利用四级种子生产程序繁殖自交系，该方法以现代遗传学理论为指导，较好地防止了玉米自交系的混杂退化．有效地保持了玉米自交系的纯度和种性，可操作性强，降低生产成本，加速自交系繁殖速度．延长种子使用年限。同时，“育、繁、推”一体化，有利于实现种子标准化。
For a long time, the use of purification and rejuvenation of corn inbred lines, there are many drawbacks. The inbred lines were bred by using four seeds production procedure. The method was guided by the theory of modern genetics, which could well prevent the hybrid degeneration of maize inbred lines. Effectively maintain the purity and species of maize inbred lines, maneuverability, reduce production costs and speed up inbreeding speed. Extend the useful life of the seed. At the same time, the integration of “education, propagation and promotion” is conducive to the standardization of seeds.