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Broussonetia papyrifera is a widely distributed tree species with strong ecological adaptability. At present, it is mainly used for papermaking and developing fiberboard. According to the textual research of herbal medicine, the fruit, leaves, branches, stem bark, milk and root bark of Broussonetia papyrifera can be used as medicine, which has the effects of diuresis, tonifying kidney, invigorating stomach, diminishing inflammation, cooling blood and stopping bleeding. 65438108 It was learned from the Science and Technology Department of Chengdu Institute of Biology, China Academy of Sciences that the researchers of this institute discovered an extraction method and application of Broussonetia papyrifera alkaloids, and obtained the invention patent authorization from China National Intellectual Property Administration. The method takes the roots, skins and leaves of Broussonetia papyrifera as raw materials, extracts with water or aqueous alcohol solution at room temperature or heating, extracts with ethyl acetate and n-butanol after concentration, and concentrates the n-butanol extract to obtain Broussonetia papyrifera total alkaloids. The researchers studied the inhibitory activity of total alkaloids extracted from Broussonetia papyrifera leaves on α -glucosidase and found that they had strong inhibitory activity. Therefore, Broussonetia papyrifera alkaloids can be used to develop drugs for preventing and treating diabetes and its complications, obesity and viral colds.