1. Leave the poisoned environment quickly and move the patient to fresh air, immediately open the window in a closed room for ventilation, loosen the patient's collar and belt, keep the respiratory tract unobstructed and keep warm. If breathing or heartbeat stops, cardiopulmonary resuscitation should be performed immediately. 2. Correcting hypoxia and taking oxygen immediately can accelerate the dissociation of carboxyhemoglobin and promote the discharge of carbon monoxide. If conditions permit, hyperbaric oxygen therapy should be performed immediately. Hyperbaric oxygen chamber treatment can increase dissolved oxygen in blood, improve arterial oxygen partial pressure and quickly correct tissue hypoxia. Hyperbaric oxygen therapy should be performed at an early stage, preferably within 4 hours. If the patient is in a coma or the carbon hemoglobin is greater than 25%, even if the patient is not in a coma, it is an indication for hyperbaric oxygen therapy. If there is no hyperbaric oxygen equipment, high concentration mask oxygen supply or nasal catheter oxygen supply should be used. 3. Improve the metabolism of brain tissue. For long-term coma, high fever or frequent convulsions, hibernation therapy can be used to cool the head, reduce the metabolic rate of the brain and increase the tolerance of the brain to hypoxia. Early intravenous infusion of ATP, coenzyme A and cytochrome C can promote the functional recovery of brain cells. Dehydrators and diuretics can be used to prevent brain edema, and 20% mannitol 250 ml can be injected intravenously. If necessary, it can be used in combination or alternately with furosemide. 4. Give symptomatic treatment to hypotensive shock, dilate anti-shock, give diazepam and phenobarbital to convulsion, and give broad-spectrum antibiotics to pulmonary infection.