Breathing relaxation methods include abdominal breathing, lip-contracting breathing and so on. 1. Abdominal breathing: relax both hands, inhale through the nose, exhale through the mouth, feel the movement of the chest and abdomen when breathing, inhale and exhale, the abdomen expands and falls back, the chest does not move. Abdominal breathing can enhance the diaphragm contraction force, and promote the diaphragm and abdominal muscles to work together when breathing. 2. Lip-contraction breathing: inhale through the nose, exhale slowly with the lips slightly contracted, and exhale to blow the paper 30cm in front of you. Lip-contraction breathing can increase the airway pressure, reduce the speed of exhalation, reduce the pressure on the airway due to the rapid decline in pleural cavity pressure, shift the pressure balance point, and delay the closure of the small airway. In addition to the above two methods, there are other ways to carry out respiratory relaxation training, choose a suitable method for yourself can be.