慢性阻塞性肺部疾病（COPD）是呼吸系统的常见病，早期对病人影响不大，但中晚期特别是出现呼吸衰竭后，可引起全身多系统功能和／或器质性损害。明确1型呼吸衰竭（以缺氧为主）和11型呼吸衰竭（同时伴有高碳酸血症）与肺功能的关系，对了解COPD患者肺病理生理功能改变以及指导 Chronic obstructive pulmonary disease (COPD) is a common respiratory disease that has little effect on patients in the early stages. However, systemic and / or organic systemic systemic and / or organic damage can be caused by advanced or later respiratory disease in particular. To clarify the relationship between type 1 respiratory failure (mainly hypoxia) and type 11 respiratory failure (accompanied by hypercapnia) and pulmonary function, to understand the changes and guidance of pulmonary pathophysiological function in COPD patients