Chronic obstructive pulmonary disease (COPD) is one of the most common and frequently-occurring respiratory disease, the mortality rate of which ranked the 4th of all causes of death and there is a trend of increasing year by year. COPD is one of the major causes of disease death in China which ranked third～fourth, and the incidence rate shows an increasing trend. Elderly patients account for a large proportion in COPD patients, and the treatment is difficult with high mortality rate. Early diagnosis, early prevention, and standardized treatment can reduce the frequency of exacerbation and improve the prognosis as well.