Abstract: The group Ⅲ of compound cereal, obtained by mixture technique, was used as material to produce the special precast powder of compound cereal beverage by liquefied enzymatic hydrolysis, amylase and cellulase were mixed, composite ratio was 1∶1. Based on the single factor test, the response surface was chosen, and best results were obtained:substrate concentration 6.60%, enzyme concentration 0.40%, tempreture 61.45℃, time 90 min, DE value reached 54.88%. The important order of each factor was as follow:enzyme concentration>time>tempreture>substrate concentration.