This paper presents a preliminary study of the distribution characteristics and key formation processes of Blue Carbon sources and sinks in the development of the marine industry. Given the limited availability of statistical data for the secondary and tertiary sectors of the marine industry and the absence of carbon sequestration assessment methods，this paper introduces the measurement of the level of carbon sequestration in China’s marine primary industry using the carbon coefficient method and the average trophic level method. Additionally，it uses the grey prediction model GM （1，1） to forecast the level of Blue Carbon in China’s marine primary industry for the period corresponding to the “Carbon Peak” and “Carbon Neutrality” targets. The findings are summarized as follows：（1）The development of the marine primary industry possesses dual attributes of being both a source and a sink，whereas operations in the marine secondary industry are primarily carbon-emitting，offering limited means to enhance carbon sequestration. The formation of sources and sinks in the marine tertiary industry shows difference among different sub-sectors，with the marine tourism industry holding a greater potential for carbon sequestration. （2）The total blue carbon in China’s marine primary industry increased from 43.1935 million tons in 2003 to 51.9477 million tons in 2022，with an average annual growth rate of about 0.98%. （3）The total Blue Carbon in China’s marine primary industry is expected to rise to 60.35405 million tons by 2030，equivalent to approximate 8.0619 million hectares of afforestation，with a carbon storage value of 15.07262 billion RMB Yuan. The data for 2060 would be 89.96405 million tons，12.0171 million hectares of afforestation，and 22.46732billion RMB Yuan respectively.