* Patient with Respiratory diseases, cardio-cerebrovascular disease.
* To healthy person in high altitude areas with thin air.
* Middle-aged ,the elderly people, pregnant women, students who have been engaged in mental work for a long time and other people who suffer different degrees of physiological hypoxia. It can also eliminate fatigue and restore somatic function after heavy physical or mental exertion.
* The workers who are overworked and exhausted from oxygen supply.
