Brain death due to a car accident is basically immediate as long as there are no external appropriate assistive devices. Nowadays, with the continuous advancement of technology, the use of ventilators and the application of deep vein placement has a role in maintaining the most basic vital signs of the patient. The ventilator is used in the absence of spontaneous breathing to simulate the function of the lungs, and it is usually no problem to maintain the ventilator for about 1 week if it is used. Deep intravenous application of high doses of pro-vasoconstrictive drugs maintains blood pressure at a relatively stable stage, but any approach will cause some damage to the body and will certainly produce incalculable losses to the visceral system in the long term. Therefore, in case of brain death in a car accident, there is no autonomic respiratory and circulatory function, just maintenance, which often lasts up to 1 week, but is very expensive, and once these adjuncts are stopped, death will soon follow.