The objective of the study is to assess patient's perception with stable state COPD on symptom variability and to describe how symptom variability impacts daily quality of life in Chinese COPD patient with moderate, severe or very severe airflow limitation from tier 3 hospitals in China where most of COPD patients are diagnosed and treated.

Inclusion Criteria:

• Provision of subject informed consent
• Out-patient
• Clinical diagnosis of COPD at least 6 months
• Lung function based on data available within 3 months in medical records confirming FEV1<80% normal predicted (post-bronchodilator) and FEV1/FVC<0.7 (post-bronchodilator)

Exclusion Criteria:

• Participation in any interventional study involving investigational drugs; Patient inability to understand the study procedures or inability/reluctance to answer questionnaire
• Ongoing exacerbation of COPD or exacerbation within the previous 3 months. An exacerbation is defined as a worsening of COPD symptoms leading to a treatment with antibiotics and/or a short course of system steroids and/or hospitalisation or emergency
• History of asthma and/or allergic rhinitis, Lung cancer or any other significant respiratory disease such as bronchiectasis, lung fibrosis, interstitial lung disease, tuberculosis, sarcoidosis

Out-patient, male or female aged 40 years and over and Clinical diagnosis of COPD at least 6 months