Abstract: Experimental factors and levels were selected by a one-factor test.According tothe results of the one-factor test and the Box-Benhnken factorial design principle，a response surface methodology with three factors and three levels was used to optimize the hydrolysis conditions for the absorbance values of hydrolysate.The results showed that the hydrolysis temperature，time and the acid concentration had significant correlation with the absorbance values of hydrolysate.The optimum hydrolysis conditions were: reaction temperature 76 ℃，reaction time 13 min，and acid concentration 6.5 mol/L.Compared with the conventional hydrolysis method of thermostatic water bath heating，under conditions of constant temperature and acid concentration，microwave heating method can shorten the reaction time about one-seventh of the original，improve the content of monosaccharide in liquid by 20.8%，and results in a lighter color hydrolysis liquid.