The produce technology of diosgenin extraction by sulfuric acid hydrolysis was studied with Dioscorea zingiberensis C H Wright as the raw material.Effects of sulfuric acid hydrolysis time,usage of sulfuric acid,Soxhlet extraction time and concentration of sulfuric acid on the sulfuric acid hydrolysis of dioscin were investigated.Optimized process by orthogonal experiments was obtained as: sulfuric acid hydrolysis 20mL for 4h,Soxhlet extraction 6h,sulfuric acid concentration at 1.5mol/L.Under the above conditions,the yield of diosgenin was up to 3.762%,acid pollution was reduced.The result provides a method to solve the existing problems in the diosgenin industrial.