Aromatherapy is the method of using volatile essential oils which are obtained from plants for prevention and cure of disease. To developing field of aromatherapy on oriental medicine, we consider the effects of essential oil and herbal medicine which is related to scientific name. The results are as follows : 1. The effects of essential oils are similar to or wider than the effect of herbal medicines which are related to scientific name, because of the aromatic treatments are easy and fast. 2. The properties and flavors of herbal medicines which are related to essential oils have pungent and warm nature mostley. 3. The classifications of herbal medicines according to the meridian which are related to essential oils are spleen and stomach meridian. so it seems that the meridians of essential oils are spleen and stomach mainly. however it is needed to study more in the future that the meridians of herbal medicines which is unknown.