The proper season for collecting Ginkgo biloba L.leaves,the alcohol extracting technology of flavonoids in Ginkgo biloba L.leaves were studied in this paper.The main results show:Through determining the total flavonoids in the Ginkgo biloba L.leaves from April to December,it was found that Ginkgo biloba L.leaves should be collected from August to September;The optimum extracting technology of flavonodis in Ginkgo biloba L.leaves was investigated by using the factorial and orthogonal desi...