Abstract: Abstract：Three vegetable soybean cultivars, NAU95C-7, NAU99-10 and NAU95C-15, were used to study the developmental process of pod and seed qualities. The results showed as follows: The changes of pod form, such as length, width and thickness, with the days after flowering were well fitted with 'S' curve; the accumulations of 100-seed fresh mass and soluble sugar content with the days after flowering were well fitted with cubic equation; the suitable pod-picking period was suggested as during later-term R6 to former-term R7 on the basis of yield and quality. Then, with the major gene plus polygene model of quantitative traits, a joint analysis of multi-generations from the cross between NAU95C-7 and NAU95C-15 was carried out to investigate the inheritance of the soluble sugar and starch content. The results showed that the inheritance of two characters fitted two major genes plus polygene model. Heritability values of the major genes of F2 population were estimated as 85.8%，77.4% respectively, while those polygene were 12.3%, 12.7% respectively.

Key words: vegetable soybean, sensory qualities, development, genetic analysis