In neurosurgery, craniotomy is often required to treat some cranial disorders. The most feared post-operative complication for neurosurgeons is intracranial infection, which is a very dangerous and not easy to control complication and is a major problem for neurosurgeons. For example, intracranial infection can easily occur after craniotomy for hydrocephalus in clinical practice, and the chance of occurrence is very high. According to relevant statistics, the chance of infection in hydrocephalus craniotomy can sometimes reach more than 40% or even higher. So what are the characteristics of intracranial infections? (1) Clinical signs and symptoms of intracranial infection such as high fever, headache, and cervical tonicity. (2) Leukocyte WBC>0.01X109/L in cerebral crest fluid examination, with predominantly increased multinucleated cells. Sugar <2.25mmol/L, chloride <120mmol>0.45g/L. (3) Positive result of bacterial culture of brain crest fluid. (4) There is a definite cause of infection, such as cerebral crest fluid leakage. The diagnosis can be confirmed by having the 3rd article. If the bacterial culture of brain crest fluid is negative, the rest of the articles need to be combined. Neurosurgeons generally consider persistent high fever after hydrocephalus craniotomy to be alert for brain infection. In patients who develop intracranial infection after hydrocephalus surgery, general anti-inflammatory therapy many times fails to achieve good results. This actually requires the successful mastery of a whole set of specialist brain crest fluid techniques to effectively control intracranial infections through a comprehensive approach and subsequent hydrocephalus treatment. A comprehensive approach to the treatment of hydrocephalus in the cerebral crest fluid unit, which gives a normalized approach to the amount of cerebral crest fluid, the composition of cerebral crest fluid, ventricular wall abnormalities and the ventral wall, is the key to successful treatment.