Han Jung Pyeong Yi San is a Chinese Patent medicine, which is used for stomachic disorder, acute and chronic indigestion, dyspepsia and diarrhea in Korea. This medicine consisit of 16 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, the effectiveness of this method is exemplified by the identification of the ingredients in Han Jung Pyeong Yi San which contains 16 powdered crude drug ingredients.