Subdural effusion is usually absorbed within one to two weeks. If after two weeks, the fluid has not been absorbed, the intracranial condition has not been stabilized and surgical intervention is required. Surgery involves drilling a hole in the skull and placing a drainage tube to flush and drain the subdural fluid, which is basically removed after three days. This kind of surgery is a mode of accelerated recovery, although there is a certain amount of trauma, but often after three or four days, the subdural fluid will be absorbed and drained, and there can be a relatively good prognosis, and then continue to promote cerebral reexpansion, improve cerebral circulation, cerebral protection, and other appropriate drug therapy, and will not recur in the later stage. Therefore, it must be judged according to the situation at that time, if the conservative treatment is ineffective, then it is necessary to actively carry out surgical treatment.