This paper summarizes the chemical composition,pharmacological action & clinical application of three kind of Herba Siegesbeckiae:Siegesbeckia orientalisL,Siegesbeckia pubescens Makino & Siegesbeckia glabrescens Makino.Chemical compositions in different breeds were compared.Pharmacological action is summarized in eight aspects including antiinflammation,analgesia,anti-thrombus,ameliorating microcirculation and alleviating itching,etc.Clinical application is studied in residual back pain after clinical verte...