Abstract: The unit energy consumption of vaporization-transportation is not only an important operation indicator, but also the basis of energy-saving study at LNG terminal. This paper addressed the issue in the following process: Firstly, the process and equipment involved was introduced; subsequently, the electric power of low-pressure pump, high-pressure pump, seawater pump and other power consumption equipments were calculated, as well as the gas-consumption of torch ever-burning lamps and SCV. After that, the unit energy consumption was obtained as 4.625 kgce/t if 1 t natural gas was vaporized and transported in the minimum transportation conditions with ORV as vaporizer in summer, and the value shifted to be 25.83 kgce/t in the maximum transportation conditions with SCV as vaporizer in winter. It was found in the comparison that the unit energy consumption of running SCV was much higher than the running ORV. Finally, the relationship between the natural gas flow of transportation and the unit energy consumption was determined by computer program, as showing in the curve. From the curve, it was found that the minimum unit energy consumption about vaporization-transportation was 1.946 kgce/t, while the corresponding natural gas flow of transportation was 690 t/h. Besides, the unit energy consumption decreased while natural gas flow of transportation increased, but the unit energy consumption would increase rapidly reversely at the moment of adding running equipments.