`Jeong Wi Dan` is Chinese patent medicine, which is used for stomachic disorder, gastric and duodenal ulcer. This medicine is in the large of pills consisting 14 kinds of powdered crude drugs. For the identification of individual ingredients in such powdery mixtures, microscopic method may advantageously be used as it requires only a small amount of specimens. In this paper, effective of this method will be exemplified by the identification of the ingredients in Jeong We Dan which contains 14 powdered crude drug ingredients.