To address infra-specific relationships of Lilium cernuum Kom., and to provide the fundamental information for developing new horticultural variations, we analyzed the morphology of individuals in natural populations. It observed the external form of L. cernuum Kom., and described through dividing by each type according to a form, number and length in each organ, to distribution aspect of prop roots, and to appearance of spot in perianth lobe. Also, it described after observing the internal form and structure in each organ. As for analysis of main ingredient (PCA) by character in L. cernuum Kom., as a result of carrying out analysis of main ingredient in order to examine the appearance of being available for habitat-based distinction in L. cernuum Kom. by selecting 3 traits (length in upper leaf, length in lower leaf, length in scape), which show difference by region out of the quantitative joint characters in the selected individual, 3 wide-area groups were mutually overlapped. Thus, the group-based difference was difficult to be found. However, the following tendency could be found. In other words, as the group of L. cernuum Kom. in the northern area moves south along the Taebaek mountain range, the tendency was indicated that the lower to the Nakdong-jeongmaek leads to getting shorter in scape, to getting longer in the upper leaf, and to get shorter and then longer in the lower leaf. As another group goes down by diverging from the Taebaek mountain range to the Sobaek Mountains, the tendency was indicated that the scape gets longer and that length in the upper and lower leaves gets shorter.