Objective To research the application of rapid dura-mater reticular incision in the evacuation of acute severe subduml hematoma.Methods The clinical data of 30 patients performed evacuation of acute severe subdural hematoma in our hospital were retrospectively analyzed; the dumra maters was rapidly incised after the first bore hole being drilled,and then the dura mater was incised in reticular shape after the bone flap was formed.The subdural hematoma could effuse slowly and uniformly,and intmcranial hypertension would reduce effectively.Results The subdural hematoma of all patients was removed totally.Based on the Glasgow outcome scale (GOS) scores three months after surgery,8 patients got recovered,13 were referred to moderate maim,5 were severe disability and 4 died.By using this modified method,the acute cenencephalocele rate decreased to 23.3％,which was more effective as compared with that using traditional method (48.2％).Conclusion In acute severe subdural hematoma operation,reticular incision of dura mater may achieve rapid hematoma evacuation and controllable and balanceable decompression,increase curative rate and decrease mortality.