Subcerebellar hernia is known as subcerebellar herniation malformation, and it is impossible to tell whether it is better to operate or not to operate because of the large individual differences. If the patient has no obvious clinical symptoms, surgery may not be performed, but if there is an increase in intracranial pressure and other phenomena, surgery is required. The specific situation should be decided according to the degree of the patient’s condition. Inferior cerebellar tonsillar herniation malformation is caused by overgrowth of neural tissues or underdevelopment of brain tissues, etc. Clinical manifestations include head or cervico-occipital pain, unsteady walking, nausea and so on. If the patient has no obvious clinical symptoms or the clinical symptoms are mild and there is no neurological deficit, surgery may not be performed and conservative treatment, such as methylcobalamin and vitamin B12, may be used to relieve the symptoms. If there is obstructive hydrocephalus, increased intracranial pressure or progressive aggravation of symptoms, surgery (e.g., enlargement of the occipital foramen magnum, superior cervical laminectomy, etc.) is required. The disease is not self-curable, and most patients can be cured through active treatment. It is recommended that patients visit the hospital in a timely manner and choose the appropriate treatment plan after evaluation by the doctor.