Abstract: Objective To explore the optimal model of occupational health risk assessment in thermometer manufacturing enterprises. Methods A thermometer manufacturing enterprise was taken as a research sample,and seven models,including Composite-Index of GBZ/T 298-2017 Guidelines for occupational health risk assessment of chemical hazards in the workplace,supplemental guidance for inhalation risk assessment of environmental protection agency America（EPA）,risk assessment method for occupational exposure to harmful chemicals of ministry of manpower Singapore（MOM）,good practice guidance on occupational health risk assessment of international council on mining and metals（ICMM）,occupational health risk assessment and management guideline of Queensland Australia（Australia）,risk assessment method for occupational accidents and diseases of ministry of labor and social protection department Romania（MLSP）,and control of substances hazardous to health essentials for Health and Safety Executive England（COSHH）,were used to evaluate occupational health risks between July and October 2021. The normalized risk ratio（NRR） was used to quantitatively compare each model and analyze the similarities and differences of the evaluation results of these models. Results All the mercury concentrations in the air of mercury exposed positions in this enterprise were detected to be higher than that of occupational exposure limit（OEL）,and all these positions were assessed to have high occupational health risks. The risk assessment results of comprehensive index method,ICMM and MOM were high risk（grade 4）,which was consistent with that of expert consultation method,lower than EPA's extremely high risk（grade 5）,but higher than Australian's,COSHH's medium risk（grade 3） and MLSP's low risk （grade 3）.The consistence of NRR of the comprehensive index method to MOM and ICMM was general（Kappa=0.286,P<0.05）,and the difference was not statistically significant（Z=-1.622,-0.816,P>0.05）. The consistence of Australia and ICMM was general（Kappa=0.211,P<0.05）,and difference was not statistically significant（Z=-3.317,P<0.05）. The consistence of Australia and COSHH was poor（Kappa<0.05,P<0.05）,and difference was not statistically significant（Z=-1.000,P>0.05）.The consistency of other models were poor,and the difference was statistically significant（P<0.05）. Conclusion The comprehensive index model is suitable for the occupational health risk assessment of thermometer manufacturing enterprises,followed by MOM model and ICMM model,while the other four common models is not recommended.

Key words: Thermometer, Evaluation model, Risk assessment, Mercury, Occupational health