Brain death cannot be recovered, and the determination of brain death requires a rigorous examination and determination process, with two or more physicians qualified in brain death identification to make a joint diagnosis. Once brain death is determined, it is tantamount to declaring a person dead, which means that the patient cannot recover and has no value for further treatment. The brain is the commander of the human being, managing all the life activities of the human being. The reason why brain death cannot be recovered is because the human brain has suffered a serious injury, and it is a serious injury that cannot be reversed no matter how much it costs or how many advanced treatments are used. The significance of brain death established: first, to stop the futile and meaningless so-called resuscitation and to reduce the burden of society and families; second, it can benefit the society by donating organs to patients in need before the heart stops.