Abstract: In order to learn more about the traits and their mechanisms of Xianyu335, using some trial data on this hybrid and the research results of breeding theory, its maturity, adaptedness, resistance to stresses, tolerance to high plant density, regulation between single plant and population, as well as source-sink-flow relationship were discussed in this article. It was showed that these traits of Xianyu335 reflected many scientific breeding theories and strategies. And it was hoped that the maize breeders could get some references and inspirations.