在介绍南农４９３－１和南农１１３８－２的来源与特点的基础上，以共祖先度为指标分析了两个品种及其２７个衍生新品种间的亲缘关系，并从所衍生新品种的数量与水平和４组杂交试验的理论研究两方面论证了两个品种具有优良的配合力，它们的衍生品种继承了其优良的配合力。两品种及其衍生新品种可用于黄淮及南方大豆区的育种计划 Based on the introduction of the origin and characteristics of Nannong 493-1 and Nannong 1138-2, the genetic relationship between the two cultivars and their 27 new varieties was analyzed based on the ancestral degree, The quantity and the level and the theoretical research of four groups of hybridization experiments demonstrated that the two varieties had excellent combining ability and their derivative varieties inherited their excellent combining ability. Two cultivars and their derivatives can be used for breeding programs in Huanghuai and southern soybean regions