Effects of ethanol concentration,ratio of solvent to biomass,ultrasonic processing time,ultrasound power,and ultrasound frequency on extraction yield of gross the saponin were investigated. Water and aqueous ethanol (70%,v/v) were used to extract saponin from the Dioscorea zingiberensis C.H.Kinetics of the ultrasonic extraction was described as an unsteady-state diffusion model. The linear correlation coefficient r was 0.95. The optimal sonication time of saponin concentration in the extraction liquid reach...