Abstract:At present, the marine carbon sink trading at home and abroad has developed rapidly, but there is a lack of comprehensive analysis of the global diversified marine carbon sink trading mechanism and research on the core market elements, operation logic and key parts of the marine carbon sink trading. To this end, on the basis of combing the relevant concepts and theoretical basis of marine carbon sink trading, and based on the latest progress and experience at home and abroad, this paper discusses the ideas and countermeasures for the construction of China's marine carbon sink trading mechanism, and attempts to provide decision-making reference and intellectual support for China's construction of the relevant policy system to achieve the goal of " dual carbon ". Research points out that the elements of the marine carbon sink trading market include government departments, supply and demand sides, trading and information registration agencies, scientific research units, third-party certification agencies, and stakeholders. In order to promote the development of marine carbon sink trading, it is necessary to combine the power of the government and the market, be based on scientific theories, consider multiple benefits, smooth the development path of "scientific research - methodology research - project development - validation and verification - transaction settlement", construct a complete project certification mechanism and a diversified transaction mechanism. Based on goal orientation and problem orientation, in view of marine carbon sink trade existing organization management and technical support system to be improved, financial support and legal protection to be improved, power reduction facing multiple disputes and risk problems, given the following concrete measures, including establishing action plan, improving legal guarantee, researching scientific method, strengthening technical support, strengthening financial support and innovating financial services.