Abstract: According to flavonoides' material properity, normal butyl alcohol, npropanol and ethyl acetate are chosen solvent. The optimum extracting conditions of flavonoids from GBE, which the ginkgolide was extracted(ginkgolide contents＜0.3%). The results showed that at 25℃, the ratio of solvents of water to npropanol is equal to 1∶25, the ratio of solid to modified liquid is equal to 15∶1, the extracted time is 10 minutes, the total flavonoides of extraction was more than 50%, the obtained ratio of the total flavonoides in GBE is more than 80%.