The sequela of gas poisoning is mainly the brain, and gas poisoning first involves the cerebral cortex, and delayed encephalopathy is generally more common. The clinical manifestations are unconsciousness, mental disorder and motor disorder. Poisoned patients can also have increased intracranial pressure and even cerebral hernia. The nerve damage of poisoned patients is almost 100%, which can cause acute nervous system damage, most of which lasts for several days to weeks, and can be treated with hyperbaric oxygen, but 20 ~ 50% of patients still have delayed encephalopathy symptoms such as mental abnormality, silence, increased muscle tension and tripping. Hyperbaric oxygen compression plays a decisive role in the rehabilitation treatment of poisoning sequelae. The sooner you start treatment, the better the effect. After gas poisoning, brain tissue will be damaged, leaving symptoms and needing rehabilitation treatment. Gas poisoning has a great influence on patients, which may lead to death in most cases, otherwise it will cause brain tissue damage. There are a series of sequelae symptoms, which can be partially recovered through standardized rehabilitation training. It can be treated by hyperbaric oxygen chamber and physical therapy.