The objective of this paper is to establish an LC-MS/MS method for identification of chem. constituents in Augentropfen Stulln Mono.By using HPLC-MS/MS, reference substances, and hydrolysis test, the ingredients were identified according to their mol. weightResults show that the fifteen components were identified including esculin and fourteen digitalis cardiac glycosides.It was concluded that this method is rapid, sensitive and could be used in quality control and stability study of the product.