The risks include fire, explosion of oxygen cylinders, facial damage from catheters and masks, and dryness of mucous membranes. Secondly, oxygen inhalation may lead to carbon dioxide retention in the body. Again oxygen toxicity, which mainly occurs when the concentration of oxygen inhalation is too high, as well as oxygen partial pressure is too high will oxygen toxicity, there will be systemic functional and organic damage. Respiratory damage is mainly manifested by retrosternal pain, cough, dyspnea and reduced lung capacity, which is further aggravated by hypoxia. Damage to the brain can manifest as visual and auditory disturbances, neurological symptoms such as nausea, convulsions and syncope, and in severe cases, coma and even death can occur. In general, home oxygen therapy does not cause oxygen toxicity, but at the same time, it is necessary to pay attention to the time of oxygen intake and the concentration of oxygen intake.