The occlusion reperfusion model of middle cerebral artery in rats is widely believed to be the stan- dard focal cerebral isehemia animal model. It is widely used in isehemie cerebral vascular diseases with no need of craniotomy ,little damage, controllable, controllable time of ischemia, definite obstruction site and stable cerebral ischemia. Based on the actual operation experience and previous literature reports,the author would talk about some experience in regard to the line bolt method to prepare the middle cereb...