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Grain quality and days to flowering are major characters to be considered in vegetable soybean improvement. Theobjective of this study was to investigate the inheritance of both traits in recombinant inbred lines (RILs) derived from a crossenvironments. The traits under study were total soluble solids content (TSS) of green seed, days to flowering (DTF), and seedweight (SW). The RIL population distributed normaly with respect to the traits, suggesting that they are quantitative ones. A sig-nificant positive transgressive segregation of TSS content was also observed. The narrow sense heritabilities of TSS, DTF and SWin two environments were 58.2 vs 65.2, 91.6% vs 94.2, and 75.4 vs 90.5%, while the combined estimates acros two environmentsnvi-ronments. The negative correlation between DTF with TS and SW were found. The results obtained in our study can serve as abasic information for breeding to improve the quality traits of vegetable soybean in Thailand and her neighboring countries.