Abstract: Scientific vulnerability assessment of marine disasters is the basis of improving marine disaster monitoring, early warning, prevention and control system, and is an important part of marine disaster risk management. In this paper, Haikou city, which is prone to marine dynamic disasters, is taken as the research object. Based on the systematic investigation and analysis of disaster-affected bodies, the vulnerability of Haikou city is analyzed and evaluated from two aspects of natural and social attributes. Using GIS technology, the research results were standardized mapped. The results show that the coastal areas and densely populated areas with low altitudes are more susceptible to marine dynamic disasters. The extremely high vulnerability area of Haikou city is 439 km², which is mainly concentrated in the areas of Xiuying district, Longhua district, the northern coastal area of Meilan district and the western area of Xixiu town. The vulnerability assessment results of this paper are the results of the first thematic Marine disaster risk survey and assessment conducted in Haikou city, which can directly serve the planning layout of Haikou city and the prevention of Marine power disaster risk.