以３个随机交配的栽培大豆×半野生大豆杂交组合的Ｆ１代做待改良群体，分别用有限性、亚有限性、无限性等３个不同结荚习性大豆品种做回交亲本，组配９个回交组合。通过对这９个组合回交一代（ＢＦ１）和３个自交Ｆ２代株高、主茎粗、有效分枝数、百粒重及蛋白质含量的分析比较可以看出：以有限性品种做回交亲本对种间杂种后代降低株高、增加茎粗效果最佳，亚有限品种次之，无限品种效果最差。对分枝这一性状的改良应选用独秆型品种进行回交，而和品种本身的结荚习性无关。百粒重大的回交亲本对克服种间杂交后代的小粒性效果最佳。只要亲本选配得当，回交Ｆ１代即可分离出百粒重接近栽培大豆的单株。在蛋白质含量上用高蛋白品种进行连续回交，可逐年提高杂种后代的蛋白质含量。选用进化程度较高的半野生大豆做亲本，其组合的自交Ｆ２代及ＢＦ１代即可获得一定数量的、可供选择的单株 F1 hybrids of three randomly crossed hybrids of cultivated soybean × semi-wild soybean were selected as the reformed population. The backcrossing parents were made with three different sowing soybean cultivars of limited, sub-limited, infinite, respectively. A backcross combination. By comparing and analyzing the plant height, main stem diameter, effective branch number, 100-grain weight and protein content in the 9 backcross generation (BF1) and 3 inbred F2 generation, it can be seen that: Cross parent to inter-interspecific hybrid offspring to reduce plant height, increase stem best effect, sub-limited varieties followed, unlimited variety effect is the worst. The improvement of the trait of branching should use the single-stalk type for backcross, but has nothing to do with the pod habit of the variety itself. One hundred-size major backcross parents had the best effect on overcoming the small-grained offspring of interspecific hybrids. As long as the parent is properly equipped, back to the F1 generation can be isolated one hundred plants weight close to the cultivation of soybean. Continuous protein backcrossing with high protein varieties on the protein content can increase the protein content of the hybrid offspring year after year. Selection of semi-wild soybean with a higher degree of evolution as the parent, the combination of selfing F2 generation and BF1 generation can get a certain number of plants to choose from