Occupational health technical service institutions are institutions that carry out prevention and control work in order to protect and improve the occupational health status of employees and improve the health level of the company, including occupational disease prevention and control institutions, occupational health testing institutions, occupational disease diagnosis institutions, occupational health consulting and training institutions, etc. The qualification grade of occupational health technical service institutions can be divided into the following grades from high to low: National institutions: occupational health technical service institutions directly managed by the State Council or its authorized departments and established with approval, with the highest qualification grade and greater power. Provincial institutions: occupational health technical service institutions directly managed by the provincial government or its authorized departments, established with approval, and with the qualification grade of Grade II. Prefecture-level city institutions: occupational health technical service institutions with high qualification level directly managed and approved by the municipal government or its authorized departments.

District-level institution: an occupational health technical service institution directly managed by the district-level government or its authorized department and approved to be established, with a low qualification level. Township-level institutions: occupational health technical service institutions directly managed and approved by township governments or their authorized departments, with the lowest qualification level. Generally speaking, the higher the qualification level of occupational health technical service institutions, the more important and powerful the tasks and responsibilities they undertake, and the corresponding work needs more professional and higher-level personnel to complete.