Abstract: In response to the IMO Preliminary Strategy for Greenhouse Gas Emission Reduction from Ships and the domestic "3060 Double Carbon Goal", carbon reduction routes applicable to the domestic fleet are proposed. Using the fleet carbon reduction analysis model, the carbon reduction amount, carbon intensity and carbon reduction cost of a domestic shipping company’s fleet based on the above fuel routes are analyzed by defining the fossil fuel, methanol fuel and ammonia fuel routes. The results of the study show that the fleet based on methanol and ammonia fuel paths can meet the requirements of the "Preliminary Strategy for Ship Temperature IMO Room Gas Emission Reduction" and the domestic "3060 Double Carbon Goal", and that the fleet can be transitioned from the traditional bunker fuel type to the methanol/ammonia ready type as soon as possible in the near future, and then to methanol/ammonia powered type in the medium and long term. In the near future, we can transition from traditional fuel oil ships to methanol/ammonia fuel ready（methanol/ammonia fuel power system preset） ships as soon as possible, and in the middle and long term, we can gradually transition to methanol/ammonia fuel-powered ships; green methanol and green ammonia have their own advantages, and the number of future medium and long term commercial applications mainly depends on the differences between green methanol and green ammonia in the aspects of availability and economy.