Epiberberine is an alkaloid isolated from Coptis chinensis, acts as a potent AChE and BChE inhibitor, and a non-competitive BACE1 inhibitor, with IC50s of 1.07, 6.03 and 8.55 μM, respectively. Epiberberine has antioxidant activity, with peroxynitrite ONOO scavenging effect (IC50, 16.83 μM), and can be used for the research of Alzheimer disease. Epiberberine inhibits the early stage of differentiation of 3T3-L1 preadipocytes, downregulates the Raf/MEK1/2/ERK1/2 and AMPKα/Akt pathways. Epiberberinecan be used for the research of diabetic disease.