NOVELTY - Method for preparing Ginkgo terpene lactone monomer and Ginkgo general flavone involves dissolving G.biloba extract in ethanol, obtaining sediment and filter liquor, refining sediment using organic solvent and ethanol, obtaining white crystals, obtaining ginkgolide A, B and C white powder, again obtaining ginkgolide A, B, C using ethyl acetate or ethanol and normal hexane or diethyl ether, obtaining lactone monomers, merging filter liquors, obtaining acid liquor and concentrating non permeable liquid to obtain ginkgo general flavones.    USE - The method is useful for preparing Ginkgo terpene lactone monomer and Ginkgo general flavone.    ADVANTAGE - The method is simple, efficient, cost-effective and more suitable for production applications, improves quality of products, and produces lactone monomers having purity of more than 98% and general flavones having purity of more than 90%.    DETAILED DESCRIPTION - Method for preparing Ginkgo terpene lactone monomer and Ginkgo general flavone involves (a) dissolving extract of G.biloba (EGB 761) in ethanol (10-100 vol.%), recycling ethanol by polyamide resin purification treatment and refrigerating the extract at 0-5 degrees C for 1-10 days, (b) filtering the refrigerated liquid using double-deck filter paper or millipore filter and collecting the sediment and filter liquor, (c) refining the obtained sediment by (i) adding purified water into the sediment, heating and dissolving the sediment, extracting the sediment by organic solvent or extracting by directly using organic solvent, collecting organic phase, concentrating the organic phase liquid, drying the concentrate, heating and dissolving the concentrate in ethanol (15-50 vol.%) having 10 times volume of the concentrate, placing the solution at normal temperature or refrigerating the solution at 0-5 degrees C for 1-2 days, crystallizing the solution, obtaining white crystals, separating white crystals, vacuum drying the crystals, obtaining ginkgolide A, B and C, vacuum drying the ginkgolide, obtaining white powder having purity of more than 95%, reducing pressure, concentrating and drying the mother liquor, heating and dissolving the concentrate in ethanol (1-10 vol.%) having 1-10 times volume of the concentrate, placing the solution at normal temperature or refrigerating and crystallizing the solution, obtaining ginkgolide, vacuum drying the ginkgolide and obtaining white powder having purity of more than 95%, (ii) adding purified water for heating and dissolving the sediment, extracting the sediment by organic solvent or extracting by directly using organic solvent, collecting organic phase, concentrating the organic phase liquid, drying the concentrate, completely dissolving the concentrate in ethyl acetate or ethanol, where the volume of ethyl acetate or ethanol is 1/4-1/8 times the volume of concentrate, adding normal hexane or diethyl ether, where the volume of hexane or diethyl ether is 5-20 times the volume of the solution, placing the solution at normal temperature or refrigerating the solution at 0-5 degrees C, obtaining white crystals, separating white crystals, vacuum drying the crystals at 60 degrees C, obtaining ginkgolide A, B, C white powder, where the total content of ginkgolide mixture is more than 95%, (iii) passing the two obtained mixture crystallized powders through medium voltage preparative column for purification, eluting the column using organic solvent, collecting the eluent in sections, successively obtaining ginkgolide C, ginkgolide A, ginkgolide B or bilobalide, ginkgolide C, ginkgolide A, ginkgolide B, concentrating the eluent after respectively combining the eluents, drying the concentrate, and obtaining lactone monomers, (d) merging the filter liquor obtained in step (b) and the mother liquor after crystallization in steps (i) or (ii), adjusting the pH of the solution to 3-8 using sodium hydroxide solution (1-10 vol.%), sodium carbonate solution (1-10 vol.%) or sodium bicarbonate solution (1-10 vol.%), adsorbing the solution through anion exchange resin after washing using purified water, discarding the eluent, eluting the solution using alkali liquor, saline solution or alcoholic solution, adjusting the pH of the eluent to 3-5 using hydrochloric acid solution (1-10 vol.%) to obtain acid liquor, and (e) removing salt and micromolecular impurities having molecular weight of 150-250 dalton from the acid liquor using organic composite membrane filtration device, collecting non permeable liquid and concentrating and vacuum drying the liquid to obtain ginkgo general flavones.