In order to achieve the target of energy saving and emission reduction in 2030 and 2050, to achieve green shipping, the transformation of traditional fuel ships to new energy vessels is an inevitable trend, therefore, it is necessary to analyze the environmental and economic benefits of many new energy vessels and find out the optimal new energy ship type. In order to more objective, efficient and fair comparison of the performance of various types of new energy vessels, with traditional fuel ships as the benchmark, the use of power models to analyze the emission reduction effects of various new energy vessels, economics as an auxiliary reference, and finally found that: LNG container ships relative to traditional fuel container ships can reduce pollutant emissions by 80%, compared to other new energy ships earlier economic advantages, and not limited to technical problems difficult to promote, is currently the best choice to achieve green shipping.