Liquefied natural gas (LiquifiedNaturalGas, referred to as LNG), the main component is methane, is recognized as the most clean energy on Earth. Colorless, odorless, non-toxic and non-corrosive, and its volume is about 1 / 600 of the same amount of gaseous natural gas, The weight of liquefied natural gas is only about 45% of the same volume of water. The manufacturing process is that the first puried the production of the gas field, and liquefied by a series of ultra-low temperature, last transported by the LNG boat. Combustion of the air pollution is very small, and release heat, so the liquefied natural gas well.