Abstract: National occupational health standard—Specification for Assessments of Intakes and Internal Doses of Radionuclides has been approved and issued by the Ministry of Health. Based on the extensive research of literature, systematic study of the relevant laws and regulations related to the specification, this specification was enacted according to the principles about it. It is mainly used for estimating the occupational radiation internal dose. This article explained the important technical content and proposed suggestions for the publicity and implementation of the standard.