For experimental studies on the anticonvulsion effect and it was measured in mice that toxigenic effect, influence on the central nervous system, anticonvulsion effect, mechanism of anticonvulsion effect by change of GABA level and glutamic acid in brain, effect of the creation and degradation system of brain oxygen free radicals in convulsion. The results were obtained as follows: 1. Samulanshintang was perfect medicine without toxigenic effect. 2. Pretreatment of Samulanshintang did not influence on the central nervous system. 3. Pretreatment of Samulanshintang did not influence on maximal electric seizure(MES), strychnine, bicuculine and picrotoxin, but pentylenetrazol(PTZ)-induced convulsion significantly decreased. 4. Effect of Samulanshintang except for Jinsa on the PTZ-Induced convulsion decreased. 5. Effect of Samulanshintang fragrance(SMATF) and Samulanshintang distiled water(SMATW) on the PTZ-induced convulsion did not influence. 6. Decrease of brain GABA level in PTZ-induced convulsion was increased by pretreatment of Samulanshintang. 7. Decrease of brain glutathione content in PTZ-induced convulsion was increased by pretreatment of Samu- lanshintang. 8. GABA-T activity increased by PTZ-induced was controlled by the pretreatment of Samulanshintang. 9. Increase of brain lipid peroxide content in PTZ-induced convulsion was decreased by pretreatment of Samulanshintang. 10. Significant increase of brain xanthine oxidase and aldehyde oxidase activities in PTZ-induced was controlled by pretreatment of Samulanshintang. 11. Decrease of brain superoxide dismutase(SOD), catalase and glutathione peroxidase activities in PTZ-induced was decreased by pretreatment of Samulanshintang. From the above results, Samulanshintang was perfect medicine without toxigenic effect and was recognized anticonvulsion effect by decreasing brain glutamic acid level and increasing brain GABA level. Samulanshintang have an effect on creation and degradation system of brain oxygen free radicals in convulsion, thus it was considered that Samulanshintang could be applied in convulsive disorder as epilepsy, febrile seizure and spasm etc.