There is lack of quality control and evaluation indexes for standard COPD management in hospitals 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 in China, and evaluating the therapeutic efficiency after standard COPD management. This part is a prospective cohort which lasts 2 years. After standard COPD management according to GOLD 2017 by doctors in hospitals in China, patients will be followed up for their outcome after 1 year. Several indexes will be selected to evaluate the quality control of standard COPD management and its efficiency. The controls are from hospital-based subjects with a retrospective cohort study.