Low blood oxygen refers to the oxygen content or oxygen concentration in the blood is too low, mild low blood oxygen through the body’s compensatory effect will not produce serious harm, but long-term low blood oxygen or serious low blood oxygen will lead to the body long-term hypoxia, tissue and organ oxygen supply is insufficient, thus producing dysfunction. Therefore, hypoxia should be treated and corrected from the following aspects: 1. Actively treat the primary disease, there are many diseases that cause hypoxia, including respiratory system diseases and circulatory system diseases, other systemic diseases, treat the primary disease to remove the root cause of hypoxia. 2. Give oxygen therapy, generally through the inhalation of additional oxygen outside can effectively correct hypoxia. However, if long-term correction is not possible, mechanical assisted ventilation can be given. 3, for lung diseases such as chronic obstructive pulmonary disease caused by hypoxia, appropriate respiratory function exercises can be carried out to improve the compensatory capacity of lung function. 4, people with low blood oxygen should try to avoid confined spaces, keep the indoor air clear, and avoid strenuous exercise, so as not to cause too fast and excessive consumption of oxygen and aggravate the symptoms of hypoxia.