Objective:To extract and distinguish the total flavanone from the leonurus.Methods:Using the reactions which present colors under th e ultraviolet ray, NH 3-H 2O and AlCl 3 to analyse the flavanone.Results:The total flavone contained in the leonurus is abo ut 0.28%, and the recovery rate is 98.6%.Conclusion:The method is simple, convenient and no polluti on,which can be used to extraction the flavone from the leonurus.