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本文对黄早4及6个改良系、Mo17及6个改良系的配合力及其与改良杂交种遗传关系进行试验研究。结果表明：黄352、565、444三个黄早4改良系在子粒品质、抗病性上优于黄早4；751、412而个Mo17改良系花期正常相遇，并在较多性状上一般配合力优于Mo17；黄352、565、444、751、412五个改良系的一般配合力方差和特殊配合力方差在单株产量、百粒重、健株率、穗长、行粒数等性状上高于原系，即好于黄早4、Mo17；黄352×751、565×412、444×412三个完全改良杂交组合均表现高抗玉米青枯病，分别比黄早4×Mo17增产34．6％、29．4％、27．1％，均达极显著水平，且熟期（生育日数）相近，可以代替黄早4×Mo17在生产上推广应用。
In this paper, the combining ability of 4 and 6 improved lines, Mo17 and 6 improved lines and their genetic relationship with improved hybrids were studied. The results showed that the three yellow-yellow-4 improved lines of yellow 352,565,444 had better grain quality and disease resistance than yellow-morning 4; 751,412 and Mo17 improved lines normally met at the flowering stage, Force better than Mo17; yellow 352,565,444,751,412 five modified lines of general combining ability variance and special combining ability variance in single plant yield, 100 kernel weight, healthy plant rate, spike length, grain number and other traits Higher than the original line, that is better than Huangzao 4, Mo17; yellow 352 × 751,565 × 412,444 × 412, three completely improved hybrid combinations showed high resistance to bacterial wilt, respectively, compared with Huangzao 4 × Mo17 34.6%, 29.4% and 27.1%, respectively, reaching extremely significant levels, and the mature period (the number of days of birth) were similar, which could be used instead of Huangzao 4 × Mo17 in production.