Transcatheter embolization using absolute ethanol is a widely used technic in interventional radiology. But its mechanism of action and embolization effect on various infusion speed are poorly understood. Authors performed an experimental study in rabbits to doccument the effect of absolute ehtanol on various infusion rate. The results are as follows: 1. In high speed infusion group (>0.1ml/sec. n=13), 11 cases showed peripheral obstruction and 2 cases showed central obstruction. 2.In low speed infusion group (<0.1ml/sec. n=12), 4 cases showed peripheral obstruction and 8 cases showed central obstruction (p<0.02) 3. On follow-up aniography performed 4 weeks later (n=8), no demonstrable significant differences are found between two groups.