Electric ship is one of the most promising technology directions for the development of shipbuilding industry. It's an important measure to achieve carbon peaking and carbon neutrality goals under the field of waterborne traffic. Focusing on the current situation of the promotion of the electric ship in recent years,taking examples of the application practice of electric ships in Jiangsu, the characteristics of the electric ship, such as high construction cost, low operating cost, and significant environmental emission reduction benefits, are analyzed through experimental data. Based on the main features, the promotion mechanism of the electric ship is further analyzed. The relevant measures and results of Jiangsu practice are expounded. Through the construction of charging/battery swap infrastructure facilities for the electric ship and the reduction of the using cost of electric ships, new directions for the large-scale promotion of the electric ship are provided.