Objective:To investigate the correlation between lung function and serum calcium and phosphorus levels in COPD patients. Methods:Lung function,serum calcium,phosphorus data were collected from COPD group,smoking group and control group for a retrospective analysis. Results:Compared with the smoking group and control group,the serum calcium and phosphorus levels were decreased in COPD patients (P < 0.05 and P < 0.01,respectively). Hypertension had no effect on serum calcium and phosphorus levels(P > 0.05) in COPD patients. Lung function in COPD group was not significantly related to serum calcium and phosphorus levels(P > 0.05). Conclusion:There is a metabolic abnormality of calcium and phosphorus in COPD patients,although no relationship was shown between lung function and serum calcium and phosphorus levels.