Abstract: This paper studied on the segragation and stability of the qualitative character in the generation of soybean interspecific crosses. The results indicated that the characters of hilum shape and seed shape are easiest to be stab-lized and both selections can be taken in the early generations. In the inheritance of flower color, pubescence color, hilum color and soil film, F1 has obvious relation between the domination and the recessive. The segragation ratio of F2 is appoximatly 3 : 1 which is controlled by one gene. But some combinations give the ratio of 9 : 7, 13:3. The results indicated that these characters are effected with two pairs of genes and exist complementary gene and inhibiting gene.Pod bearing habit and leaf shape are typical ecological character and variate with the change of enviroment. The segragation of leaf shap and growth habit is similar to qualitative character. However, some transitional form exist between tip leaf and round leaf trailing plant and erect plant, and present continous distribution. Meanwhile,they express quantitative character, especialy in the segragation of seed coat colons more complicated. Therefore, qualitative character and quantitative character not be divided completely. It is determined by the grade standard system. The different standard give the different form.

Key words: Soybean, Interspecific cross, Qualitative character, Hereditary variation