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针对玉米育种遗传基础狭窄的突出问题，分析了热带、亚热带种质研究和在育种中利用的现状、存在问题，指出要加强我国引进、研究和利用热带、亚热带种质的工作，讨论了温热杂优模式、先敏感等问题研究的一些思路．
In view of the prominent genetic problems of maize breeding, this paper analyzes the status quo and existing problems of the research on tropical and subtropical germplasm and its utilization in breeding. It points out that we should strengthen the introduction, research and utilization of tropical and subtropical germplasm in China, Miscellaneous model, the first sensitive and other issues of some ideas.