Abstract: Objective To understand the current status of occupational stress and depression among workers in a tire manufacturing factory in Shandong Province,and analyze the relevant factors that affect the occupational stress and depression symptoms of workers in various tire processing processes. Methods From July to August 2023,a simple random sampling method was used to investigate 453 employees of a tire manufacturing factory in Shandong Province.The effort reward imbalance（ERI） questionnaire, positive psychological capital questionnaire,and patient health questionnaire（PHQ-9） were used to investigate the correlation between occupational stress,positive psychological capital,and depression status among workers in the factory,and the data was analyzed. Results The occupational hazard factors generated during the production process of the tire manufacturing factory mainly include noise,organic and inorganic dust,toxic and harmful gases,high temperature,and organic solvents,etc. Among the 453 research subjects,366 were male and 86 were female. Among the workers,there were 2 workers with occupational stress（0.44%）,and 282 workers with depressive symptoms（62.17%）. Compared with workers in tire rubber refining positions,the total depression symptoms of workers in the tire forming position and finished product inspection position increased by 1.942 and 2.562 points,respectively（both P<0.05）. Compared with workers who frequently drink alcohol,workers who do not drink alcohol or occasionally drink alcohol had a 0.942 points increase in the total score of depression symptoms（P<0.05）. Compared to workers who frequently smoke,workers who do not smoke or occasionally smoke had a total depression symptom score reduction of 1.765 points（P<0.05）. Compared with workers with A type personality,workers with B type personality had a decrease in the total score of depression symptoms by 1.046 points（P<0.05）,while workers with C type personality had an increase in the total score of depression symptoms by 1.191 points（P<0.05）. The dimensions of effort,return,and intrinsic engagement in the ERI model of occupational stress had a significant impact on the total score of depression symptoms among tire factory workers（all P<0.05）. The scores of effort and intrinsic engagement dimensions were negatively correlated with the total score of depression symptoms among tire factory workers,while the score of the return dimension was positively correlated with the depression symptoms among tire factory workers（all P<0.05）. Conclusion The depression situation among workers in a tire manufacturing factory in Shandong Province is severe. Management should regularly monitor the mental health status of workers,take targeted measures to reduce the occurrence and development of depression symptoms,and protect their psychological health from multiple dimensions.

Key words: Tire manufacturing factory, Occupational stress, Depression symptoms, Imbalance between effort and return