Asthma is the main symptom of emphysema patients, and wheezing often occurs during activities. How to prevent emphysema and improve the quality of life is a problem that every patient with chronic bronchitis has to face. Chronic bronchitis refers to the recurrent cough, expectoration or asthma as the main symptom, which lasts for more than two years and lasts for three months every year. The main measures to prevent emphysema in patients with chronic bronchitis are: patients should realize that smoking is harmful to health, and smokers should quit smoking immediately; Avoid inhaling harmful dust, smoke or gas. Factories and mines should deal with dust and harmful gases well, such as using wet operation, sealing dust sources, strengthening ventilation and personal protection; Prevention of respiratory tract infection, including virus, mycoplasma or bacterial infection. Regular injection of influenza vaccine and streptococcus pneumoniae vaccine. It has certain significance for preventing susceptible population; Regularly monitor the pulmonary ventilation function (FEV 1, FEV 1/FVC and FEV 1%) of patients with chronic bronchitis, and find the occurrence of airflow restriction as soon as possible and take corresponding measures; In addition, improving the living standard of patients, increasing nutrition, strengthening health education, improving working environment and conditions, and developing good hygiene habits are of great significance to the prevention and treatment of this disease. Patients with chronic bronchitis and emphysema mainly take rehabilitation treatment in the stable period, among which the exercise of respiratory function is particularly important. The method and steps are as follows: Body position: lying position, sitting position or standing position. When lying flat, you can put a soft pillow under your knees and relax your abdominal muscles. Steps: put your left and right hands on the upper abdomen and chest respectively; When exhaling, the abdomen sinks, and a little pressure is applied by hand to further increase the abdominal pressure and promote the lifting of the diaphragm; When inhaling, the upper abdomen resists the pressure of the hand and slowly bulges; Requirements: Breathe still, inhale through the nose, exhale with contracted lips, inhale and exhale slowly and evenly, and the time ratio of inhalation and exhalation reaches1:2 ~ 3; Three times a day, each time 10 ~ 15 minutes.