These studies were conducted to investigate the effect of Yijin-tang on the anticonvulsion, analgesic, sedative actions, effect on blood vessels and blood pressure. The result of these studies was summarized as follows; Suppressive action was shown on convulsion due to cerebrocortical causes, but no such actions were noted either myelic or diencephaltic causes in mice. Analgesic and sedative actions were significantly recognized in mice. Increasing of blood pressure and vasocontractive actions were noted.