As climate change is aggravated by environmental pollution, environmental regulations on harmful gas emissions, which are the main cause, are being tightened. As a countermeasure against regulations, the introducing of LNG fueled propulsion ships using LNG as the fuel is considered the most reasonable alternative. Major industrialized countries around the world are proposing various policies in preparation for the introducing of LNG fuelled ship, and major shipowners have already introduced LNG fuelled ship. In Korea, the introducing of LNG fuelled ship is beginning to take place, and the introducing of LNG fuelled ship for offshore vessels is positively considered. It is not possible to introduce LNG fuelled ship at the same time. In this study, the priority of introducing of ships was derived by evaluating the economical efficiency and the effective ship type by prioritizing introducing of ships among many ships operating in coast.