Abstract: Objective To understand the case number,survival status and epidemiological characteristics of occupational pneumoconiosis cases in Changzhou City in order to provide evidence for the prevention and control of pneumoconiosis. Methods The total number of occupational pneumoconiosis patients diagnosed in Changzhou were investigated,and the survival,stage,region and disease distribution were analyzed. Results A total of 784 cases of occupational pneumoconiosis were diagnosed from 1963-2020 in Changzhou,including 708 males and 76 females. 370 cases survived,including 214 cases in Wujin District（57.84%）,86 in Liyang City（23.24%）,413 died and 1 lost to follow-up. 446 cases（56.89%） had stage Ⅰ pneumoconiosis,225（28.7%） had stage Ⅱ pneumoconiosis and 113（14.41%） had stage Ⅲ pneumoconiosis. There was no significant difference in the gender composition with different stages of pneumoconiosis cases（χ²=0.003,P>0.05）,there was significant difference in the composition of survival and death of different stages of pneumoconiosis cases（χ²=31.560,P<0.05）,and there was significant difference in trend chi-square test（χ²=31.519,P<0.05）. The survival rate of stage Ⅰ pneumoconiosis cases was significantly higher than that of stage Ⅱ pneumoconiosiscases（χ²=11.433,P<0.05） and stage Ⅲ pneumoconiosis cases（χ²=27.039,P<0.05）,and the survival rate of stage Ⅱ pneumoconiosis cases was significantly higher than that of stage Ⅲ pneumoconiosis cases（χ²=5.995,P<0.05）. Non-metallic mining and beneficiation industry（214 cases,27.30%） and public management,social security and social organizations（135 cases,17.22%） were the main industries. 435 cases（55.48%） were in Wujin District,173（22.07%） in Liyang City and 97（12.37%） in Zhonglou District. There were 601 cases of silicosis（76.66%）,76 foundry pneumoconiosis（9.69%）,and 42 welder pneumoconiosis（5.36%）. Among the surviving patients,209（56.49%） were aged ≥70 years,67（18.11%） were aged 60-<70 years,and 94（25.41%） were under 60 years old.There was no significant difference in age composition between the surviving populations of different sexes（P>0.05）. There was no significant difference in age composition among survivors at different stages（P>0.05）. Conclusions Occupational pneumoconiosis in Changzhou city is mainly in stage I,and the disease type is mainly silicosis,most of them in Wujin District and Liyang City. Wujin District and Liyang City have the bulk of surviving patients.Institutions such as Pneumoconiosis Rehabilitation Stations are highly recommended. The higher the stage of pneumoconiosis,the lower the survival rate. Therefore,we should pay attention to the early detection,early diagnosis and early treatment of pneumoconiosis. In recent years,the number of pneumoconiosis cases in Changzhou city has increased,and the task of prevention and control is still arduous. Employers should take the main responsibility for occupational disease prevention and control,and the health supervision departments should focus on the supervision of enterprises that produce silica dust.

Key words: Occupational pneumoconiosis, Follow-up studies, Epidemiologic studies