The work aims to provide reference for the safety preparation and supervision of super large special-shaped contaminated equipment in unpacked transport in the decommissioning of nuclear facilities in China in the future. The regulations and requirements for unpacked transportation of super large surface contaminated objects (SCO) in relevant IAEA standards and technical guidelines were sorted out, and the practical experience of Germany and France was fully discussed. The assessment, preparation and verification, supervision and evaluation of pollution source items involved in the outer pack were discussed in accordance with Chinese existing nuclear safety supervision requirements. The definition of super large special-shaped surface contaminated objects (SCO-III) proposed for the first time in the latest IAEA standards was of great guiding significance for China's subsequent practice. However, how to incorporate it into China's nuclear safety supervision and obtain practice still required further detailed research in terms of technology and management. The revision of existing regulatory standards for SCO-III should be carried out as soon as possible in China, while regulatory and technical requirements should be supplemented for unpacked transport of SCO-III. It is recommended to adopt special arrangement for the licensing of SCO-III shipments to improve the transport safety.