Abstract: As one of the application scenarios of CCUS, marine carbon dioxide (CO₂) geological storage is an effective way to achieve carbon emission reduction in coastal areas. Based on the analysis of typical cases of global marine CO₂ geological storage, this paper believes that China has great potential for CO₂ storage. In the next step, the site selection of pilot projects should pay attention to the evaluation of target-level and site-level sequestration potential, carry out classified site selection according to different conditions, and monitor geological risks throughout the pilot projects. According to the source-sink match of CO₂ geological storage in different basins in China's sea area and the construction conditions, the following is proposed: The CO₂ associated gas storage project in offshore oil and gas fields is a type of priority pilot project, and the cooperation between CO₂ enhanced oil/gas recovery and storage has practical application value. The storage project of depleted oil and gas reservoirs is an important choice for pilot projects, and the whole-chain large-scale offshore saline aquifer CO₂ reservoir storage project is the future development direction.