Abstract: To improve the effect of corn stalk pretreatments, the methods of enhancing the acidic electrolyzed water(AEW) property had been focused on, including low-temperature electrolysis at 0℃, magnetization before the electrolysis and pumping Cl2 into the AEW. All of these methods could intensify the pH value and oxidation-reduction potential (ORP) value, respectively. Pumping Cl2 into AEW had the best effects that the pH value could reach as much as 1.87 while ORP value reached 1226 mV. Using the intensified AEW(pH value 1.92, ORP value 1 218 mV) to pretreat the corn stalk had got a better result that hemicellulose degradation rate could reach 68%, while original AEW (pH value 2.30, ORP value 1 175 mV) reached 61%, and the hydrochloric acid (pH value 2.30) only reached 53%. For AEW getting a much better result than the hydrochloric acid with the same pH value, it had verified the oxidability played an important role in the hemicellulose degradation during lignocellulose pretreatment. This research would be an enlightenment in developing AEW application field and explore new methods for biomass pretreatment.