1.Know the history of pregnancy, fetal maturity, delivery history, hypoxia and resuscitation and other triggers. 2.Understand the clinical symptoms and signs, especially the detailed examination of the neurological signs. 3, Cranial ultrasound, CT, MRI and other imaging examinations to understand the location and extent of bleeding. ultrasound is very sensitive to the diagnosis of periventricular-intraventricular hemorrhage, and CT and MRI are more sensitive to hemorrhage in the subarachnoid space, cerebellum and brainstem. Lumbar puncture is helpful for the diagnosis of intracranial hemorrhage and timely exclusion of intracranial infection. Intracranial hemorrhage is manifested as elevated cerebrospinal fluid pressure, light yellow, microscopically visible crumpled red blood cells. Hypoglycemic cerebrospinal fluid disorder occurs within a few days after hemorrhage and lasts up to about 1 month, and the lymphocyte count may be mildly increased. However, in a few cases of subarachnoid hemorrhage and parenchymal hemorrhage, the cerebrospinal fluid may be free of abnormal findings.