1. The pre-job occupational health examination is a compulsory occupational health examination, which should be completed before the operators engage in harmful operations;
2. On-the-job occupational health examination refers to the workers who have been engaged in occupational hazard factors that need occupational health monitoring for a long time, and should have regular health examinations during their on-the-job period. If you are exposed to harmful substances such as dust, noise and benzene for a long time, you should have regular health checks. The periodic health examination period should be determined according to the nature of different occupational hazards, workplace, concentration or intensity of harmful factors, incubation period of target diseases and protective measures.
3. Occupational health examination when leaving the post. Laborers shall undergo occupational health examination when leaving their posts before preparing to transfer or leave their jobs or posts.