Soyasaponins are main active substances which have been widely applied on medical industry. The traditional way of extract soyasaponins usually use the methanol which is noxious. In this experimentation, the edible ethanol and water were used to extract the soyasaponins. The orthogonal experiment was used to optimize the extract technique. The result showed that extract rate of edible ethanol was better than that of water. So the more suitable extract condition was: 70% edible ethanol concentration, 80℃ extracting temperature, 1:18 the radio of defatted soybean meal to solvent, 4 hours extracting time for each of two extracting processes.