Abstract: Australia organic Maca powder was used as raw material,active substances were extracted by edible alcohol.Maca liquor was prepared by concentration of extracting solution,modulation with liquor,low temperature sedimentation and filtration.Optimum extraction technology of active substances in Maca powder was investigated by optimizing alcohol concentration,solid- liquid ratio and extraction time based on extracting yields of alkaloids and glucosinolates,and then the contents and stability of alkaloids,glucosinolates and macamides were monitored.The optimum extracting conditions were as follows: edible alcohol concentration 90%,ratio of material to solvent 100 mg / m L,and soaking time 6 d.Under these conditions,the extraction yields of alkaloids,glucosinolates and macamides were 91.10% ± 1.30%,92.28% ± 1.64% and 90.50% ± 1.86%,respectively. Preservation yields of alkaloids,glucosinolates and macamides were 81.20% ± 1.26%,68.33% ± 1.04% and 81.76% ± 0.78%,respectively.Glucosinolates were decreased most and followed by alkaloids,macamides had the best stability in Maca liquor within 6 months in the stability test for Maca liquor in half a year.