By studying the fascia theory illustrated by CHENChaozu, a professor of Chengdu U niversity of Chinese Medicine,the author points out that the application of Gegen in Treatise on Cold Damage and Miscellaneous Diseases(Shang Han Za Bing Lun) of ZHANG Zhongjing,which includes Gegen tang,Gegen plus Banxia tang,Guizhiplus Gegen tang,Gegen Qinlian tang and Bentun tang, can be discuss fromthe actions of Gegen, which includes relieving pain softly, arresting convulsions, vomiting and diarrhea, as well as relieving panting. It provides a theoretical basis for elaborating Geg...