Elderly people who suffer from chronic obstructive pulmonary disease, bronchial asthma, pulmonary heart disease, heart failure and respiratory failure, oxygen inhalation is very beneficial. Especially, low-flow oxygen intake at home is more beneficial to the elderly for lung function protection and heart function protection, even if heart failure and respiratory failure occur, oxygen intake is the basic treatment means. Older people have poorer cardiopulmonary function, and their ability to take in oxygen is obviously weakened. If they suffer from chronic diseases, especially chronic respiratory diseases, they need to recommend long-term home oxygen therapy, which can effectively delay the development of pulmonary hypertension, chronic pulmonary heart disease, respiratory failure and heart failure, so the benefits of oxygen in the elderly far outweigh the disadvantages.