The best time to do hyperbaric oxygen for brainstem hemorrhage, the best time to do hyperbaric oxygen for brainstem hemorrhage is after the acute phase of brain hemorrhage, usually after 10 days, then early hyperbaric oxygen therapy has a better effect on improving the blood supply and oxygen supply to the brain, promoting the decreasing of cerebral edema, as well as promoting the growth of nerve axons and promoting the recovery of nerve repair function. But there must be a prerequisite for doing hyperbaric oxygen is that the patient’s body temperature is below 38℃, there is no obvious coughing and coughing, the patient can be assured that there is no need to aspirate sputum within two hours, there is no pulmonary alveoli, and the patient’s eardrum is not perforated, in which case it is safer to do hyperbaric oxygen and can significantly shorten the recovery time.