At home and abroad in recent years,a lot of reaserch had been done for the mechanism and treatment of cerebral vasospasm induced by subarachnoid-hemorrhage, though there is not a complete theory can explain it very well.The predecessor's research for the clinical treatment has important significance for cerebral vasospasm,The mechanism about nitric oxide, endothelin, inflammatory reaction,which cause the cerebral vasospasm has been accepted, and in recent years the research about signal transduction,cell apoptosis also provide new method for the treatment of cerebral vasospasm.