【摘要】 本文通过对中国玉米生产和育种用种质的分析，发现我国玉米种质主要集中在四大杂优群，利用的主要模式有５种。重点讨论了各玉米区主要杂优群和杂优模式的选择、改良与利用等问题，并根据各地成功的经验和自己的育种实践，对其与地方种质、外来种质结合利用等提出了意见和建议更多还原

【Abstract】 The analysis of Germplasms utilized in corm breeding and commercial production demonstrated that Chinese Maize Germplasms mainly concentrate in four principal Heterosis Groups and five Utilizing Models.The selection,improvement and utilization about principal Heterosis Groups and Models in Maize producing areas have been discussed Moreover,by considering the successful experence and the breeding practice,advice and proposal about the comprehensive utilization of principal utilized,local and exotic Germplasms were given.更多还原