Abstract: Objective To explore the effect of occupational stress on occupational fatigue among cardiology medical staff in six grade-A tertiary hospitals in Sichuan Province,analyze the mediating role of psychological capital and coping style,so as to provide reference for reducing the occupational fatigue of medical staff. Methods From November to December 2021,a convenient sampling method was used to collect 267 medical workers of cardiology department in six grade-A tertiary hospitals in Sichuan Province,and a questionnaire investigation was coducted by the general information questionnaire,occupational stress scale,psychological capital scale,positive coping style scale and occupational fatigue scale,and the data were analyzed. Results The scores of occupational stress,psychological capital,positive coping style amd occupational fatigue of 267 medical workers of cardiology department in grade-A tertiary hospitals were （46.53±14.86）,（97.13±14.74）,（33.47±7.59） and （7.05±2.54）points,respectively. The total score of occupational stress and the scores of each dimension were positively correlated with the total score of occupational fatigue and the scores of each dimension（r=0.176-0.682,all P<0.05）,the total score of psychological capital and the scores of each dimension were negatively correlated with the total score of occupational fatigue and scores of each dimension （r=-0.182--0.640,all P<0.05）,and the total score of positive coping style was negatively correlated with the total score of occupational fatigue and the scores of each dimension（r=-0.285--0.594,all P<0.05）. The psychological capital of medical workers in cardiology department played a partial mediating role between occupational stress and occupational fatigue,and the mediating effect was 0.088,accounting for 15.12 % of the total effect. The positive coping style played a partial mediating role between occupational stress and occupational fatigue,and the mediating effect was 0.110,accounting for 18.90 % of the total effect. The psychological capital and positive coping style played a chain mediating role between occupational stress and occupational fatigue,and the mediating effect was 0.036,accounting for 6.19 % of the total effect. Conclusion The occupational fatigue of medical workers in cardiology department in six grade-A tertiary hospitals of Sichuan Province is at a medium level,and occupational stress can indirectly affect occupational fatigue through the mediating effect and the chain mediating effect of psychological capital and coping style.

Key words: Medical staff, Occupational stress, Psychological capital, Positive coping style, Occupational fatigue, Mediating effect