This paper demonstrates the properties of technical terms in general and introduces the efforts to refine the medical terms in contemporary Korean. There are many Sino-Korean terms which are too difficult to comprehend in the medical field. In the ⌜Medical Termonology ; the 4th edition⌟, we suggest many original Korean words be substituted for the Sino-Korean words. This suggestion has been made with cautin and it is hoped that the new terms will gradually replace the traditional Sino-Korean terms.