Abstract: This paper points out some limits of LPG (Liquefied Petroleum Gas) and CNG (Compressed Natural Gas), compares and analyzes the properties of LNG (Liquefied Natural Gas) and other automobile fuels, such as LPG, CNG, gasoline and diesel oil.It is concluded that LNG is the cleanest, safest, most economic and available automobile fuel.It is convenient and flexible to charge LNG for LNG automobile.The cold energy of LNG can be recycled, and LNG can be easily changed to CNG in L-CNG service station.Presently, LNG is thought as the most perfect automobile fuel, and has a large market demand and good prospect.