Abdominal breathing has the following benefits: 1, improve lung capacity, because the use of abdominal breathing can achieve greater expansion of the thorax, which can enhance the expansion capacity of the alveoli and gas volume, improve cardiopulmonary function, reduce the probability of cardiovascular disease, lung disease and other diseases. 2, promote gastrointestinal digestive capacity, because abdominal breathing can play a role in changing the abdominal cavity pressure, enhance the role of abdominal organ activity, abdominal cavity Organ activity is mainly reflected in the peristaltic movement of the intestines and blood circulation in the digestive tract, thereby promoting the discharge of toxins from the body and preventing the occurrence of constipation. The disadvantage of abdominal breathing is that it is easy to cause respiratory diseases, because abdominal breathing generally through the oral cavity for inspiration and ventilation, and the oral cavity compared to the nasal cavity without nasal hair, nasal mucus and other defense tissue, airborne bacteria, viruses or harmful micro-particulate matter, more easily into the human respiratory system, may cause the occurrence of respiratory diseases.