Currently, the pollution of fog and haze is becoming increasingly serious. As a clean and efficient energy, the proportion of natural gas in the energy structure improves continuously. This paper describes the natural gas and liquefied natural gas (LNG) resources in the current world. The current trade situation and main consumer markets of LNG are analyzed. It also shows the main trade way and characteristics of LNG and provides basic information and basis for exploitation and sustainable development of liquefied natural gas in the new century.