As population growth leads to a corresponding increase in the number of buildings, many high-rise buildings produce pressure, resulting in the extrusion and subsidence of underground rocks in the city. To create a sustainable life, building floating cities on the sea has become one of the important directions to solving ecological and environmental problems. At the same time, using traditional building materials in the construction process means a large amount of transportation costs, etc. By studying the application of marine aggregate concrete in floating cities and confirming its feasibility, it can reduce construction costs and save local resources. This paper mainly studies the coral aggregate concrete and sea sand concrete which have been put into production. This paper mainly gives the corresponding solution to the problem of the easily corrosive reinforcement existing in the concrete application of seawater sand concrete. This paper suggests using a new corrosion-resistant, high-performance material FRP reinforcement to show the feasibility of seawater Marine aggregate concrete in the construction of floating cities. The research in this paper can provide the theoretical basis for the application of Marine aggregate concrete in subsequent floating city construction projects.