The characteristics of sympathetic reflex induced by electroacupuncture of "Zusali" acupoint and record ed from the postganglionic sympathe- splanchnic nerve were studied in 38 rabbits. The results may be summarized as follows: 1. The sympathetic reflex potential induced by electroacupuncture consi- sted of excitatory phase followed by inhibitory phase. Considerable varia- bility and individual difference in this reflex phases were observed. 2. Both the excitatory and inhibitory phases were increased with the augmentation of intensity

friquency and duration of the electro-stimulus. 3. The effect induced by stimulation also varied with the intensity applied to the same acupoint and the combination of various acupoints. It was found that variation in stimulus quantity and acupuncture points may show coresponding different effects. 4. Increase of the excitability of medullary centers by blocking the carotid artery and injecting Pentylentetrazolum strengthened the reflex in- duced by electroacupuncture

although some difference between these two kinds of effects was noticed. It is thus assumed that the variabllity of the Points-stimulation in- duced visceral reflex observed in our experiment may be responsible for the unstable needling effect in clinical practice. The medullary reticular formation is supposed to be the center of visceral refflex also the site of integration of somatic stimulation on this reflex.