Abstract: A method for the extraction and isolation of alkylphenols in Ginkgo biloba leaves was introduced.Through silica gel column separation,TLC and HPLC preparations,six monomers were acquired.By UV,IR,MS, ¹H NMR and ¹³C NMR,the structures of these compounds were determined,and were confirmed by comparison with literature.The structures of these compounds were identifited as:3-(8-pentadecenyl)phenol,3-[-4(Z),7(Z) heptadecadienyl]phenol,3-(10-heptadecenyl)phenol,6-(8-pentadecenyl)salicylic acid,6-(10-heptadecenyl)salicylic acid and 5-(8-pentadecenyl)resorcinol.The position of the double bonds in compound 3-[4(Z),7(Z) heptadecadienyl]phenol was determined from the GC MS spectrum of its oxide and methylated products.

Key words: Ginkgo biloba leaves, alkylphenol, ginkgolic acid, ginkgol, bilobol