ABSTRACT Objectives : To present a differential standard of Armeniacae Semen and Per sicae Semen that are easily confused.Methods : It was planed a differential standard form through outer appea rance of the original plant, outer appearance in the form of each medicines and the appearance of the interior form through a microscope for each samples. Using an standard compound amygdalin, each sample s have been analyzed by HPLC and TLC.Results : It was possible to distinguish the orignal plant between Armen iacae Semen and Persicae Semen through its leaf shape and calyx type. In Outer appearance in the form of each medicines, there was no difference pre-existing method(measuring length and width). In vascular pattern of the surface, however, there was a clear difference that Armeniacae Semen was developed more reticulated branches than Persicae Semen. In appearance through a microscope, it has not been possible to find a clear difference in the per original plant. However, there was a clear difference between Armeniacae Semen(1 layer) and Persicae Semen(3 layer) in inner albubemen cell. In TLC analysis, there was no difference in the pattern between samples. But in HPLC analysis, Armeniacae Semen showed amygdalin content higher on a verage.Conclusions : It will be possible to find various differences in the outer appearance of the original plant, the outer appearance in the form of each medicines, the appearance of the interior form through a microscope and physical and chemical research component.Key words : Armeniacae Semen, Persicae Semen, Identification, Morphology