In clinical practice the human body needs to be relieved from hypoxia due to various reasons by oxygen intake, which is beneficial at this time. If excessive oxygen intake, including high concentration, high pressure, and too long time intake of oxygen, adverse reactions can occur to the detriment of the human body. Excessive oxygen intake can produce large amounts of oxygen free radicals, which can damage the body’s tissue cells, cause metabolic disorders and even cause cancer. A series of clinical manifestations, such as cough, chest tightness, even nausea, vomiting, palpitations, convulsions, etc. may also cause blindness.