Objective:To analyze the correlation between levels of C1q tumor necrosis factor-related pro-tein 3(CTRP-3)and C1q tumor necrosis factor-related protein 12(CTRP12)and global initiative(GOLD)grading and prognosis of chronic obstructive pulmonary disease(COPD).Methods:A total of 126 patients with COPD in the hospital were selected from September 2022 to January 2024 and included in the case group,and 90 healthy volunteers receiving physical examination were assigned into the control group.The clinical data and serum CTRP-3 and CTRP12 levels were compared between both groups.According to the GOLD grading,COPD patients were classified into grade Ⅰ group(n=9),grade Ⅱ group(n=21),grade Ⅲ group(n=43)and grade Ⅳ group(n=53).The levels of CTRP-3 and CTRP12 among the four groups were compared.The prognosis in the case group was recorded,and the CTRP-3 and CTRP12 levels were compared among patients with different prognosis status.Pearson correlation analysis was adopted to explore the correla-tion between clinical indicators and levels of serum CTRP-3 and CTRP12.Results:The age,gender,body mass index,smoking history and underlying diseases between the two groups manifested no statistical differ-ences(P>0.05).WBC in the case group was higher(P<0.05)while FEV1 and FEV1/FVC were lower than those in the control group(P<0.05).The levels of CTRP-3 and CTRP12 were lower in the case group(P<0.05).There were statistical differences in the levels of CTRP-3 and CTRP12 among COPD patients with different GOLD grades(P<0.05).CTRP-3 and CTRP12 levels were manifested as grade Ⅰ group>grade Ⅱ group>grade Ⅲ group>grade Ⅳ group(P<0.05).Compared with the poor prognosis group,the levels of CTRP-3 and CTRP12 in the good prognosis group were higher(P<0.05).Correlation analysis showed that serum CTRP-3 level in COPD patients was negatively correlated with smoking history and GOLD grading(P<0.05),and was positively associated with FEV1/FVC(P<0.05).CTRP12 level was negatively correlated with smoking history,WBC and GOLD grading(P<0.05),and was positively correlated with FEV1/FVC(P<0.05).The levels of CTRP-3 and CTRP12 were not correlated with the duration of COPD,hospital stay and FEV1(P>0.05).Conclusion:Serum levels of CTRP-3 and CTRP12 in COPD patients are lower com-pared with those of healthy people,and are negatively correlated with smoking history and GOLD grading,and positively correlated with FEV1/FVC level.