The after-effects of gas poisoning can usually be alleviated with active treatment, but rarely can they be cured. The after-effects of gas poisoning indicate that the poisoning time is relatively long, resulting in a longer period of oxygen deprivation of the brain, and irreversible damage to the nervous system will occur. Severe gas poisoning patients after active resuscitation after awakening, there will be about 2-60 days of false healing period, may appear delayed encephalopathy symptoms, manifested as dementia and stiffness, tremor paralysis, hemiplegia, seizures, sensory-motor disorders and so on. Sequelae of gas poisoning need to be actively treated, insisting on hyperbaric oxygen therapy, and at the same time, medication should be given, such as nutritive neurological drugs, such as methylcobalamin tablets, vitamin B1 tablets and so on. For patients with long-term coma, while strengthening nutrition, attention should also be paid to nursing and passive limb movement to prevent the formation of bedsores and limb spasms. The sequelae of gas poisoning can be reduced as much as possible after comprehensive treatment and improve the quality of life of patients.