The dioscin was extracted from dry yam powder with alcohol in this experiment. After hydrolysis reaction, filtration, neutralization, dehydration, extraction using petroleum ether and recrystallization, high purity diosgenin was obtained. Results of intermittent extraction process show that after three times extraction for 2h-1h-0.5h, the yield of diosgenin can reach 2.45%, using the solvent of 95%(volume content) alcohol, at the liquid-solid ratio 5:1 and temperature 60℃. Continuous homogeneous extraction process was also researched to increase extraction efficiency and facilitate continuous production. The research shows that continuous homogeneous extraction at pressure 60MPa can achieve equal effect to intermittent extraction. Acid consumption and waste water of intermittent extraction and continuous homogeneous extraction decrease dramatically compared to the traditional process, and the yield of diosgenin increases.