Redox electrode was used to control redox potential at four different levels(-50mV,-100mV,-150mV,-230mV) for the study of ethanol fermentation. The result showed that there was notably influence on the yield of ethanol ,the formation of glycerol, the secretion of organic acid，biomass and the death of cell by controlling redox potential at different levels. For example: the biomass of ORP at -50mV was 1.26,1.86,2.59 times higher than ORP at -100mV、-150mV、-230mV respectively, the final glycerol concentration was 1.2,1.1,1.7 times higher but final ethanol concentration was 0.87,0.49,0.51 times lower compared to the latest three ORP control level. And take biomass, ethanol yield, glycerol concentration, and unconsumed glucose into consider, we get the conclusion that it is very favorable for ethanol fermentation by control ORP at 150mV. So it give us a apocalypse that we can use redox electrode to control the ethanol fermentation exactly on bioreactor scale.