The invention discloses the preparation method of compound 3 α-Akebonolic acid and the application in preparing glycosidase inhibitor.The present invention extracts separated potent a-glucosidase inhibitor from Three Akebia Decne Species vegetable material source is abundant extract preparation method easy operating and also can make plant itself be utilized for a long time without destruction when adopting fruit to extract can increase economic efficiency environmentally friendly again and this monomeric compound is stable easy to store.Pharmacological evaluation demonstration the a-Glucosidase inhibitor specific activity one line diabetes medicament acarbose of compound 3 α-Akebonolic acid is stronger is expected to be further development of the medicine of prevention and clinical treatment type Ⅱdiabetes mellitus has applications well DEVELOPMENT PROSPECT.

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