Objective To study the extraction technology optimization of flavonoids of Ginkgo bilobal and the anti tumour of the extraction of Ginkgo bilobal(GBE).Methods Different methods of alkali,alcohol and acetone were used.The ratio of solid to liquid and extrating time were optimized.Hela cell was cultured in RPIM 1640 without calf and in GBE as revulsant.After 24h,the expression of Bcl 2 mRNA was measured.Results The result showed that the best process was that alcohol concentration was 70%,the ratio of solid t...