The technology of sulfuric acid hydrolysis on orange peel residue products was studied in this paper.Results showed that the optimum condition for single factor experiments was;temperature 120 °C;time 60 min;sulfuric acid concentration 0.15 mol/L;liquid-solid ratio 10:1.Then a L9(34) orthogonal experiment was designed.The results showed the optimum pretreatment was 0.15 mol/L of sulfuric acid;10:1 of liquid-solid ratio;120 °C for 90 min.Under these conditions,the yield of reducing sugar was up to 51.25%,and the weight loss was 84.1%.It indicated that the use of sulfuric acid hydrolysis crystallized sugar marinated orange peel residue was feasible.