Objectives : Through the comparative study on cases of acupuncture therapy in Sanhanlun(傷寒論), it would be expected to comprehend the theory of acupuncture for external contraction(外感). Method : It has been done to analyse provisions of Sanghanlun, Hwangdineijing(黃帝內經), Nanjing(難經) related with acupuncture, and to compare the symptoms reported in Hwangdimingtangjing(黃帝明堂經) to Shanghanlun. Result : Most symptoms of the acupuncture points in Shanghanlun correspond with those in Hwangdimingtangjing. Visceral manifestation theory could explain the reason why some acupuncture points in Shanghanlun were selected, but Meridian theory could in 1 case only. Some provisions show that acupuncture was treated to increase the effect of medicines and the others to replace medicines. Conclusion : The main principle to select acupuncture in Shanghanlun were the effectiveness of each point and visceral manifestation. Acupuncture was tried to increase or replace the effect of medicines.