Does Pulmonary Daoyin of China Give Additional Benefit Over Usual Therapy in Management of Stable Chronic Obstructive Pulmonary Disease?

Inclusion Criteria: * A confirmed diagnosis of moderate to very severe COPD. * Age between 40 and 80 years. * Without participation in other interventional trials in the previous one month. * With the informed consent signed. Exclusion Criteria: * Patients with poor mobility that can not do the exercise, i.e. wheelchair bound. * Pregnant or breast-feeding women. * Resting pulmonary artery pressure \> 45mmHg. * Any psychiatric condition rendering the patient unable to understand the nature, scope and possible consequences of the study. * Patients with severe comorbidities, including acute myocardial infarction and unstable angina pectoris. * Patients with post exercise syncope and osteoarthrosis that affect movement. * Complicated with severe heart failure (class II to IV NYHA heart function). * Complicated with bronchial asthma, bronchiectasis or active tuberculosis; * Complicated with obliterative bronchiolitis or diffuse pantothenic bronchiolitis， * Complicated with pneumothorax, pleural effusion or pulmonary embolism. * Complicated with neuromuscular disorder which affects the respiration. * Complicated with tumors . * Complicated with serious hepatic and renal diseases. * Long periods of bed rest . * Participating in other trials or allergic to the used medicine.