The rhizomes of Salvia miltiorrhiza Bunge(Labiatae) has been used in Chinese traditional medicine for the treatment of coronary heart diseases and myocardial infarction. As a part of a research for standardization of crude oriental drugs, we have determined the content of tanshinone IIA in Salvia miltiorrhiza purchased from various regions of Korea. The HPLC method by which quantitative analysis was conducted, showed reproducible results and chromatographic isolation of tanshinone IIA was accomplished successively.