There are good conditions for forming tight sandstone gas in Kekeya area, Tuha Basin, including abnormal pressure sealed formation, good conditions of gas source and wide distribution of extra-lowporosity and lowpermeability reservoirs. Because of the unique geological conditions in this area, it developed a set of sealed formation at the depth of about 3 000 m, formed the upper and lower pressure system, and the geochemical characteristics of petroleum are different. The upper tight sandstone gas reservoir has normal pressure system and bottom water structure. The tight sandstone gas reservoir of the lower pressure systemhas the following characteristics: the gas source condition is good and it is typically self-generating and self-preserving; the gas is widespread in the tight sandstone and the “sweet spots” are of industrial value; there are no closed water-oil interface between gas sand and the “sweet spots” gas reservoir except for the higher tectonic position; the gas reservoir has overpressure and gas is well preserved with the sealed formation. According to the forming characteristics of tight sandstone gas reservoir, the range of the tight sandstone gas reservoir in Kekeya-Shanle area is predicted.