Abstract:The hydrolysis of cellulose from sweet potato residue by cellulase was studied.Sweet potato residues after starch removal and pectin extraction were used as raw materials.The parameter of cellulase hydrolysis of sweet potato residue was optimized by single factor and orthogonal test. The results showed that the optimum parameters for enzymatic hydrolysis of cellulose from sweet potato residue are as follows that the solid-liquid ratio of sweet potato residue and water was 1∶25 （g/mL），the pH 5.0，the cellulase added was 50 U/g sweet potato residue，and incubation for 16 hours at 50 ℃.Under the optimum process parameters，the conversion of cellulose of sweet potato residue reached（4.52±0.14）%.