<p>Calcium carboaluminate was successfully prepared by a simple and efficient one-step method, and the effects of temperature, time, raw material ratio, carbonate type and heavy CaCO₃ particle size on the products were investigated in detail. The results show that increasing the temperature and extending the reaction time can enhance the yield and crystallisation degree of calcium carboaluminate. The proportion of Ca (OH)₂, Al(OH)₃ and CaCO₃ is a pivotal factor in the synthesis of calcium carboaluminate. When the ratio of Ca (OH)₂, Al(OH)₃ and CaCO₃ is 3:2:1, the diffraction peaks of calcium carboaluminate in the products are relatively sharp and strong. Furthermore, the purity and crystallinity of the synthesized calcium carboaluminate are higher when heavy CaCO₃ with the particle size of 120 mesh is used as the carbonate raw material, in comparison to CO₂, Na₂CO₃ and light CaCO₃. As results, a simple and efficient method for the synthesis of calcium carboaluminate is proposed, which will provide a solid experimental foundation and technical support for the industrial application of calcium carboaluminate in marine concrete.</p>