Abstract:In this study，corn bran residue was used as raw material to obtain insoluble dietary fiber after treatment.The dietary fiber was modified by biological enzyme method.The effect of double enzyme hydrolysis process on the yield of water-soluble dietary fiber was mainly studied.The results showed that xylanase and cellulase hydrolysis of corn bran residue could significantly improve the yield of soluble dietary fiber.The optimal hydrolysis conditions were as follows： cellulase 30 mg/g substrate，xylanase 40 mg/g substrate，solidliquid ratio 1∶12（g/mL），hydrolysis time 90 min.Under these conditions，the yield of soluble dietary fiber was 2.996%.