In order to investigate the effect of Kamiondam-tang on the cardiovascular system and sedative action, pharmacological studies have been carried out with water extract. The results of this investigation were summarized as follows; The sedative action was significantly recognized in mice. Vasodilative action in rabbit peripheral blood vessel and hypotension in anesthetized rabbit were remarkably recognized. Inhibitory effect of cardiac systolic action was recognized by Straub method in frogs.