银杏是我国特有的珍稀植物，利用其叶片提取的有效药用成分的药理活性的研究十分广泛。银杏叶被视为新药的宝库，目前，德、法、日等国已开发出大量的银杏叶提取物制成品，显著名的是EGb761。银杏叶有效成分在7～8月已达最高含量，之后逐渐减少，等秋天自然落叶后收集叶片不可 Ginkgo biloba is a peculiar rare plant in China. The pharmacological activity of effective medicinal ingredients extracted from its leaves is very extensive. Ginkgo biloba is considered a treasure trove of new drugs. At present, Germany, France, Japan and other countries have developed large quantities of finished products of Ginkgo biloba extract, notably EGb761. Ginkgo biloba active ingredients reached the highest content in July to August, then gradually reduced, so fall leaves after the natural deciduous leaves can not