The diagnosis of brain injury is based on birth history, clinical symptom presentation and relevant auxiliary examinations. Most clinical infants with brain injury require cranial MRI, which is non-invasive, non-radiographic, relatively safe, and has high diagnostic value. However, it takes a long time and its use is somewhat limited when the pediatric patient has abnormal breathing. In addition, if the examination index is normal, but the clinical manifestation has the symptoms of brain injury, it is also necessary to combine with brain function monitoring, genetic metabolism and other examinations to make a comprehensive diagnosis.