There is lack of quality control and evaluation indexes for standard COPD management in hospitals at different levels in China, leading to nonstandard in COPD management and discrepancy in therapeutic efficiency. This study focuses on establishing quality control and evaluation indexes for standard COPD management in hospitals at different levels in China, and evaluating the therapeutic efficiency after standard COPD management. This study is an observational study which lasts 2 years. After standard COPD management according to GOLD by doctors in hospitals at different levels in China, patients will be identified their compliance on doctors' advice and prescription, and followed up their outcome after 1 year. Several indexes will be selected to evaluate the quality control of standard COPD management and its efficiency.