LNG (Liquefied Natural Gas) is the liquid form of the natural gas. Natural gas is developed in gas field, and it is composed of firedamp. The conversion of natural gas into liquid is achieved through refrigeration by cooling natural gas to -162°C. Liquefied natural gas can save the storage room and transportation cost, and it have the characteristics of high calorific value and high performance.

LNG is a clean, efficient source of energy. Imports of LNG redound to the diversification of energy-consuming countries and ensure the energy security, and export of LNG contributes to the natural gas producing countries, which will develop natural gas resources effectively, increase foreign exchange earnings and promote economic development, thus LNG trade is becoming a new hot spot in global energy market.

Natural gas is more and more popular as it is a clean energy, many countries will prefer to use LNG as fuel, and natural gas is increasing rapidly in energy supply. Liquefied natural gas grows at about 12% of high-speed growth per year, which becomes one of the world's most rapid growths in energy industries. In recent years, global LNG production and trade have become increasingly active and LNG has become a scarcity of clean resources, and is becoming a new hot spot in oil and gas industry. In order to ensure energy supplying diversity and to improve the energy consumption structure, a number of energy consuming nations take more and more attention to the introduction of LNG, such as Japan, South Korea, the United States and Europe has constructed LNG receiving station in large-scale. International oil companies also move their new profit growth point towards LNG business, LNG will become the next hot energy commodities after the oil.