The success rate of subcerebellar tonsillar hernia surgery is generally high, but the patient’s medical condition has an impact on the success rate of the surgery and cannot be generalized. Subcerebellar hernia surgery tends to be more successful in people with less severe hydrocephalus, less severe disease, better condition, and no combination of underlying diseases such as diabetes or high blood pressure. However, the success rate of the surgery tends to decrease in people who are more severely ill, in poor condition, or who have a combination of underlying diseases such as high blood pressure or diabetes. When subcerebellar tonsil hernia surgery is needed, patients are advised to choose a regular hospital for consultation and treatment under the guidance of a doctor, and post-operative care needs to be strengthened to prevent complications.