Abstract: Objective To understand the application of three different occupational health risk assessment models in synthetic rubber manufacturing industry. Methods In January 2024,an on-site occupational health survey was conducted on a synthetic rubber manufacturing enterprise in Nanchong City,and the exposure concentration of time weighted average（C_TWA） of chemical toxin exposure positions was detected.Qualitative evaluation method,contact ratio method,and comprehensive index method were used to evaluate their occupational health risks and analyze the applicability of these three methods. Results The main positions exposed to chemical toxins in this enterprise were polymerization,rubber washing,and rubber drying positions,with the main exposure to chemical toxins being ethyl acrylate and n-butyl acrylate.Except for the ethyl acrylate（C_TWA of 28.6 mg/m³） in the rubber washing position,which exceeded the reference occupational exposure limit（OEL）,all other positions were exposed to chemical toxins below the OEL.The risk level evaluated by the qualitative evaluation method was higher than that evaluated by the contact ratio method and the comprehensive index method. The Kappa values of the three methods compared to each other were all 0，indicating poor consistency. Conclusion There are occupational health risks of chemical poisons in this enterprise，and personal protection of workers should be strengthened. The evaluation results of three methods are inconsistent. The qualitative evaluation method is easy to overestimate the risk level，and the contact ratio method has incomplete evaluation factors，while the comprehensive index method is more in line with the actual situation.

Key words: Occupational health, Qualitative evaluation method, Contact ratio method, Composite index method