Abstract:Objective:To separate and identify the active flavonoids from Beijing Propolis.Method:The flavonoids were isolated by column chromatography with silica gel and polyamide,purified with Sephadex LH 20,and elucidated on the basis of NMR,MS,UV,IR and CD spectra.Result:Six kinds of flavonoids were obtained and elucidated as Ⅰ:pinostrobin,5 hydroxy 7 methoxy flavanone;Ⅱ:pinocembrin,5,7 dihydroxy flavanone;Ⅲ:tectochrysin,5 hydroxy 7 methoxy flavone;Ⅳ:chrysin,5,7 dihydroxy flavone;Ⅴ:izalpinin,5 hydroxy 7 methoxy flavonol and Ⅵ:galangin,5,7 dihydroxy flavonol.Conclusion:Compounds Ⅰ,Ⅱ,Ⅲ and Ⅴ were found for the first time from Beijing Propolis.