Sweet potato,a crop rich in starch,is a kind of promising feedstock for fuel ethanol production.China dominates sweet potato production in Asia and globally,and sweet potato has already attracted extensive research attention and has been used as sustainable feedstock for ethanol fermentation.However,the mash from sweet potato tuber is a typical non-Newtonian fluid with high viscosity,and it is difficult to transport through pipes.Unfortunately,these properties could also affect the growth and metabolism of yeast,ultimately decreasing the ethanol concentration and fermentation efficiency and prolonging the fermentation time.