Abstract: Morinda officinalis How, together with Morinda shuanghuensis C.Y. Chen et M. S. Huang, belong to Morinda Linn. M. offici-nalis is thought ito be a king of Medicinal herbs and the M.Shuanghuensis a wild non-medicinal herbs. Because of their simi-larity in appearance between these two species, it is, therefore, necessary for us to distinguiss them in order to avoid us making mistakes in confusing one with the other. The work of distinguishing has been once carried out by south china Institute of Botany, Academia Sinica, they, in the light of classication, put the emphasis on the description of appearance of each organs. there are no reports, up to this time, about that abroad. M. Shuanghuensis was once considered as a ecotype form. In spite of their similarity in appearance of their epidermal hairs and stomata on the leavers between M. officinalis and M. Shuang-huensis, their difference can, however, be distinguished. observing in an electronic microscope, we find difference in the length of puhescence, the size of stomata apparatus, the existence of tuherculate on the surface and whether is there and division of hair-cells, and finally whether is there stomatal apparatus paracytic type. we are now able to use the scanning electronic microscope to prove that they are evidentially two different species, medicinal and non-medicinal.