There is a special clinical situation, that is, delayed encephalopathy of carbon monoxide poisoning, refers to the acute carbon monoxide poisoning symptoms basically disappeared, or basically recovered for a period of time, after 2-60 days of pseudo-healing period, the disease of mental behavioral abnormality manifestation again, which is the idiopathic manifestation of carbon monoxide poisoning, the incidence rate of about 10%, and is currently thought to be related to the change of neural demyelination. To prevent the occurrence of delayed encephalopathy in clinical practice, it is mainly recommended that the patient should have a full course of treatment and sufficient dosage in addition to timely hyperbaric oxygen therapy in the course of treatment, which should not be done for 1-2 times and then no longer done. In order to avoid this situation, try to have a course of treatment, such as mild poisoning, it is recommended that the patient should still do 5-10 times; moderate carbon monoxide poisoning, it is recommended that the patient should do 20-30 times; if severe or critical patients, it may be necessary to insist on doing 50, 60 times, or even half a year time, to reduce the sequelae.