利用13个玉米自交系，按NCⅡ不完全双列杂交设计配制成42个杂交组合，随机区组排列，田间品比鉴定和室内鉴定相结合。结果表明，西农672产量配合力高于昌7-2和7117，穗长、结实长、穗行数和行粒数性状的配合力高于昌7-2、PH6wc和7117；西农672出籽率性状配合力低于昌7-2，株高配合力低于PH6wc，高于昌7-2，也高于7117；西农672穗位高配合力高于PH6wc和7117，低于昌7-2。西农672出籽率配合力与PH6wc相近；叶面积系数、穗长、穗行数、结实长、行粒数比昌7-2高，百粒重、小区产量配合力比PH6wc略低。用PH6wc来改良昌7-2得到的西农672，综合性状改良效果较为显著。用PH6wc改良昌7-2育成西农672与用昌7-2×武117育成的7117和昌7-2相比较，其产量配合力、产量性状、农艺性状配合力等均有显著提升。

In complete Diallel Croreid Design(NCⅡcroReid design), forty-two croreides were made with thirteen inbred lines, plot arrange randomly, field determination integrate with laboratory determination. The result showed that, the yield C. A. of Xinong672 was higher than Chang7-2 and 7117; the C.A. of ear length, ear length for grain, rows per ear, grains per row of Xinong672 was higher than that of Chang7-2, PH6wc and 7117; the C.A. of grains percent of Xinong672 was lower than that of Chang7-2; the C.A. of plant height by Xinong672 was higher than that of Chang7-2 and 7117, and lower than that of PH6wc; the C.A. of ear height by Xinong672 was higher than that of PH6wc and 7117, and lower than Chang7-2. The C.A. of grains percent by Xinong672 was fairly with PH6wc; the C.A. of LAI, ear length, ear height, ear length for grain, rows per ear, grains per row of Xinong672 was higher than that of Chang7-2; The C.A. of LAI, 100 grain weight, yield of Xinong672 was lower than that of PH6wc slightly. The Xinong672 was bred from using PH6wc improvement Chang7-2, and it collected the advantage of PH6wc and Chang7-2, the synthesis improvement effect of Xinong672 was better than 7117 which from using Wu117 improvement Chang7-2 obviously. The yield C.A., yield characteristic and agronomy characteristic C.A. of Xinong672 which from using PH6wc improvement Chang7-2 had been more promoted than 7117 which from using Wu117 improvement Chang7-2 obviously.

陕西省农业重大科技攻关专项“玉米新品种选育与关键技术研究”、陕西省农业科技攻关项目“昌7-2自交系改良与玉米新品种选育研究”（2014K02-01-02）、西北农林科技大学唐仲英育种专项“资源高效型玉米新品种选育”（2005-2016）、西北农林科技大学斗口小麦玉米试验示范站西北农林科技大学推广项目