Republic of Korea is the seventh largest CO 2 emission country in 2010 and the third fastest country in the growth of CO 2 emission according to the European Commission's Joint Research Center. To mitigate the effect of CO 2 on the climate change and global warming, Korea should reduce the anthropogenic CO 2 emissions from sources such as the power plants and iron works. So carbon dioxide capture and storage (CCS) technology is regarded as one of the most promising reduction options. This study established the CO 2 transport strategies from the sources to sinks (such as the saline aquifers and gas fields in the Southeast Sea of the Korean Peninsula) for the offshore CCS in Korea. Also the cost estimations were carried out with the CO 2 transport strategies. The CO 2 transport methods suggested in this study were pipelines for both onshore and offshore, and a complex concept consisting of a pipeline for the source to coast (including the liquefaction facility on a barge) and a CO 2 carrier for the coast to sink (including the temporary storage near offshore sink). With respect to the onshore pipelines, it was desirable to construct the CO 2 transport pipelines along existing roads and/or LNG (liquefied natural gas) pipelines, as already realized in the United Kingdom (UK) and the Australia CO 2 transport chains because of the cost and environmental aspects. The CO 2 carrier was considered for the offshore CCS demonstration stage starting in 2016 to meet the timeline set by the Korea National CCS Master Plan. To optimize the CO 2 transport systems, the advantages and drawbacks for the CO 2 transport using the pipeline and shipping were analysed and the costs for them were also estimated with the CO 2 transport strategies. There were several factors to be considered before constructing the CO 2 pipelines including the amount of CO 2 , the terrain, the diameter of pipe, the transport pressure, the CO 2 quality, the transport temperature, the CO 2 state (i.e. gas, liquid or supercritical phases), etc. Also for the CO 2 shipping it should be considered such as the amount of CO 2 , the shape and capacity of CO 2 cargo tanks, the ship capacity, the liquefaction pressure and temperature, the type of the temporary storage, etc. Although the present study is now on-going to optimize the CO 2 transport infrastructure for the offshore CCS in Korea, the preliminary results show the CO 2 transport cost for the pipeline system is lower than that for the shipping in the present status.