Legal basis: Article 17 of the Law of People's Republic of China (PRC) on the Prevention and Control of Occupational Diseases. New construction, expansion and reconstruction projects, technical transformation and technology introduction projects (hereinafter referred to as construction projects) may cause occupational hazards, and the construction unit shall conduct pre-evaluation of occupational hazards at the feasibility demonstration stage. If the construction project of medical institutions may produce radioactive occupational hazards, the construction unit shall submit a pre-evaluation report on radioactive occupational hazards to the administrative department of health. The administrative department of health shall make an audit decision within 30 days from the date of receiving the pre-evaluation report, and notify the construction unit in writing. If the pre-evaluation report is not submitted or the pre-evaluation report is not approved by the health administrative department, the construction shall not be started. The pre-evaluation report on occupational disease hazards shall evaluate the occupational disease hazards that may occur in the construction project and their impact on the health of the workplace and workers, and determine the hazard categories and occupational disease protection measures. Measures for the classified management of occupational hazards in construction projects shall be formulated by the administrative department of health of the State Council.