Objective:To explore the correlation between saber-sheath trachea and COPD patient age, gender. Methods:Collection of 2012-1-1~2012-11-07 year with COPD in 348 cases, thoracic axial CT 1mm layer thickness continuous scanning. In 10mm above aortic arch level measurement of tracheal intramural coronary diameter and the sagittal diameter. The shape of the level with coronary diameter and the sagittal diameter ratio (trachea index) to express. Results:Saber sheath trachea in 37 cases, were at the age above 60 emphysema degree without a male patients;endotracheal coronary diameter length range is 9~18mm, the average 13.5mm, sagittal diameter length range is 19~32mm, the average 25.5mm, tracheal index is in the range 0.38 to 0.66, average 0.52. Conclusion:Saber sheath trachea and COPD patients age, sex is closely related to, but there is no significant correlation between the severity of emphysema. Saber sheath trachea formation is due to chronic coughing caused by tracheal cartilage ring damage, remodeling and dystrophic ossification.