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本研究通过９９份玉米自交系的密度试验、不同耐密型自交系组配的六份杂交种的密度试验，对玉米自交系的耐密性及其与株型和配合力的关系进行了研究。结果表明，自交系的耐密性是一个综合性状，涉及产量、结实性、株型、茎秤等几方面，株型是重要性状之一；自交系的耐密性和配合力，是有效地选育优良耐密型杂交种的基础．因此，严密准确的自交系耐密性鉴定以及耐密型优良杂交种选育，均应通过密度试验的实际测定比较来进行。
In this study, density test of 99 inbred lines of maize and density test of six hybrids inbred lines of different inbred lines showed that the density of maize inbred lines and their relationship with plant type and combining ability Were studied. The results showed that the inbred line is a comprehensive trait of confidentiality, yield, firmness, plant type, stem scale and other aspects, plant type is one of the important traits; inbred lines of the confidentiality and combining ability is Effective Breeding of Good Breeding Hybrids. Therefore, close and accurate identification of inbred lines and fine hybrid seed breeding should be carried out by comparing the density of the actual test.