This study used a method of injecting receptor blocking agants into ventricles of rabbit's brain to observe the effect of electroacupuncture and blood-letting puncturing at the twelve jing points of forepaws on rabbit's rheoencephalogram and to discuss the effect of central neurotransmitters and receptors in this process. The results were as follows: Adrenergic nerve β-receptor has great effect on the action of the central blood vessel when needling

while puncturing the surperficial blood vessel at the twelve jing point of forepaws to cause bleeding can be effected by central nerve m-receptor and adrenergic α-receptor

the effect may be caused by the two's cooperation.