Fifteen combinations with six soybean cultivars of different isoflavone content were formulated and planted in a randomized complete-block design model; genetic factors of isoflavone quantity were analyzed. Resuits indicated that genetic factors of isoflavone contents in F2 population inherited quantitatively. Isoflavone content of F1, F2 seeds normally trended. There were heterosis in F1, F2 of most combinations, and also heterobeltiosis in part of the crosses. The broad sense heritability of F2 was higher in parts of the crosses. It predicted the selection might be carried out preliminarily in F2 hybrids. There was significant positive correlation between hybrids and mid-parent.
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