To investigate the impact of the implementation of GBZ 98-2020 "Health Requirements and Surveillance Specifications for Radiation Worker" on the results of occupational health examination for radiation workers. In April 2022, the subjects of the study were the radiation workers who underwent occupational health examination in Occupational Disease Prevention and Treatment Institute of Hefei. The radiation workers whose registration period was from May 1, 2021 to April 30, 2022 were the new standard group, and the occupational health surveillance standard was GBZ 98-2020 "Health Requirements and Surveillance Specifications for Radiation Worker". The radiationl workers registered from May 1, 2020 to April 30, 2021 were the old standard group, whose occupational health surveillance standards were GBZ 98- 2017 "Health Requirements for Radiation Workers" and GBZ 235-2011 "Specifications for Occupational Health Surveillance for Radiation Workers". To analyze whether there were differences between the two groups in t