The Hyperbaric Medicine Branch of the Chinese Medical Association has developed a total of 61 indications for hyperbaric oxygen therapy, involving many disciplines, especially in the treatment of ischemic and hypoxic diseases, harmful gas poisoning, trauma, ischemic cerebrovascular lesions, decompression sickness, gas embolism, infection and other diseases are more widely used. All of these common diseases are covered by medical insurance reimbursement. I. Harmful gas poisoning 1. Acute carbon monoxide poisoning and its encephalopathy: hyperbaric oxygen treatment for acute carbon monoxide poisoning can save patients’ lives and reduce mortality. According to clinical studies and literature, hyperbaric oxygen can reduce the incidence of late-onset encephalopathy. Encephalopathy after carbon monoxide poisoning includes toxic encephalopathy and delayed-onset encephalopathy. Late onset encephalopathy in carbon monoxide poisoning generally occurs 2 to 6 weeks after acute poisoning. Over the past 30 years, our department has treated more than 16,000 cases of acute carbon monoxide poisoning and more than 2,000 cases of carbon monoxide poisoning with delayed onset encephalopathy, ranking first at home and abroad. 2, other harmful gas poisoning: including poisonous substances that damage the nervous system, such as organometallic compounds, organic solvents and organophosphorus poisoning; including irritant gases, such as ammonia; including asphyxiating gas poisoning; including CO, hydrogen sulfide, cyanide and other toxic substances that inhibit internal respiration; including chemical pesticides, biological pesticides, etc. While treating the primary disease, hyperbaric oxygen therapy is used as early as possible. Hyperbaric oxygen can rapidly improve the body hypoxia, control pulmonary edema and cerebral edema, and accelerate the functional recovery of the nervous system.