The indicators of intracranial infection cerebrospinal fluid are as follows: i. If a patient is suspected of having intracranial infection, the patient should be given a lumbar puncture examination and cerebrospinal fluid should be retained for routine and biochemical examination. Different pathogens, such as bacteria, viruses, fungi, and tuberculosis, lead to different changes in cerebrospinal fluid, and for intracranial infection cerebrospinal fluid appearance, some patients appear cloudy cerebrospinal fluid, such as bacterial causing septic meningitis, and in severe cases cerebrospinal fluid like rice soup; second, cerebrospinal fluid pressure is increased, protein is also increased, white blood cell count is increased, sugar and chloride are reduced, patients with viral infections appear to have increased pressure in the cerebrospinal fluid, appear to have increased cell count, tuberculosis causes intracranial infections, cerebrospinal fluid is clear, resting for a period of time appears membrane, and cerebrospinal fluid salt, sugar, chloride biochemical test results are low.