Abstract: Many regions in coastal and southeastern China can only achieve CO₂-emission reduction by offshore carbon capture and storage (CCS). Accordingly, it is necessary to assess costs related to transmission of CO₂ through subsea pipelines to clarify range of cost distribution in China. With consideration to characteristics of existing technologies and relevant costs for transmission of CO₂ through subsea pipelines, technical and economic models are established to accomplish preliminary design and cost analysis for transmission section of an offshore CO₂ storage project by using domestic cost factors. The results show that the capital cost of a 100 km pipeline ranges from RMB0.78 billion to RMB1.39 billion when the design throughout is 3-20 Mt/a, whereas the levelized cost ranges in RMB0.10-0.41. This study gives techno-economic features of the subsea CO₂ pipeline transportation for a give case in China, and may provide valuable references for construction of subsea pipeline for CO₂ transmission.