Abstract: Objective To investigate the evaluation of cardiopulmonary exercise test (CPET) in the patients with chronic obstructive pulmonary disease (COPD), and the relationship with the pulmonary function test (PFT). Methods 26 COPD patients and 30 normal controls were examined with CPET and PFT. Results The parameters of CPET, including maximum oxygen uptake (VO₂max), anaerobic threshold (AT), maximum minute ventilation (VEmax) and breathing reserve (BR) were lower in COPD group than those in control group (P<0.05). There were no significant differences in Wmax, oxygen pulse (O₂pulse) between two groups (P>0.05). VO₂max, AT, VEmax and BR were positively correlated with forced expiratory volume in one second (FEV₁) and peak expiratory flow (PEF) in COPD group （P<0.05）, but were not correlated with forced vital capacity (FVC) and FEV₁/FVC (P>0.05).Conclusion The pulmonary function of COPD patients can be evaluated with CPET, especially VO₂max, AT, VEmax and BR.

Key words: chronic obstructive pulmonary disease (COPD), cardiopulmonary exercise test (CPET), pulmonary function test (PFT), correlation