Traditional solvent extraction was used to extract total flavones from ginkgo leaves.On the basis of studying the effects of temperature,the ratios between ginkgo leaves and ethanol on the extraction rate of,flavones,the optimal technique was determined by orthogonal tests.The method of solvent extraction was the best technique for extraction of total flavones from ginkgo leaves by mixing ginkgo leaves with 75% ethanol on the ratio of 1 g∶40 m at 70 ℃ for 4h.By using this method,the extraction rate was the ...