Brain-dead patients are in a comatose state, and although respiration and heart rate exist, they are not clinically meaningful to be resuscitated, and the final outcome is respiratory and cardiac arrest, reaching death in the clinical sense. Brain cells of brain-dead patients have stopped their activities, the EEG is straight, the patient is in a deep coma, various reflexes, especially brainstem reflexes, have disappeared, and there is no response to external stimuli. For brain dead patients, a ventilator can be used to assist respiration, blood pressure can be maintained with antihypertensive drugs, and heart rate can be maintained with extracorporeal circulation machine under the operation of neurologist. However, brain dead patients are different from vegetative patients in that they cannot regain normal consciousness through resuscitation and maintenance treatment, and all brain-related sensory perception, speech, thinking and mobility cannot be restored. There is no clinical significance to resuscitate brain-dead patients, and whether to continue resuscitation depends on the wishes of the patient’s family, but it is usually of little significance.