ObjectiveTo understand the prevalence,risk factors,clinical features and the medication of coal worker's pneumoconiosis(CWP) complicated with chronic obstructive pulmonary disease (COPD). MethodsPulmonary function testing results,clinical symptoms,medication of 451 patients with CWP were collected. Then, the risk factors relevant to the incidence of COPD in CWP were analyzed with Cox multivariate regression. ResultsThe prevalence of COPD in CWP was 44.6%,and the incidence was rising with the increasing of CWP phases, exposure duration,smoking index,with the odds ratio of 3.20,1.09,and 1.01,respectively.The patients with CWP and COPD were suffered more symtoms with a CAT score of 25.5 but received less regular medications. ConclusionsThe incidence of COPD in CWP is obviously higher than that in common populaton.Exposure duration, smoking index and phases of CWP are the high risk factors for COPD in the population of CWP. The patients with CWP and COPD are suffered more symtoms but receive irregular medications.