Objective: To observe the clinical effects of Yangfei Baoyuan capsule on stablestage patients with chronic obstructive pulmonary disease (COPD). Method: one hundred and twenty subjects were randomly divided into observation group and control group (n=60 each). Both groups were adopted the conventional drug therapy. The observation group was given Yangfei Baoyuan capsule

treatment for 3 months.The lung function

BODE index and 1 year attack frequency of acute exacexbation of chronic obstructive pulmonary disease(AECOPD) were measured to evaluated the quality of life. Result: The observation group showed significant improvement compared with the control group in the following indexes:forced espiratory volume in 1 second(FEV1)

modified medical research council scale (mMRC) and BODE index were more lower than those in the control group (P<0.05).1 year number of AECOPD and hospital treatment is superior to the control group. Conclusion: Yangfei Baoyuan capsule can significantly improve the lung function

AECOPD and BODE index in patients with COPD

and treatment of patients with COPD has significant curative effect.