Abstract: In this paper,we discussed the origin of natural gas in Xiangxi formation, Mid Sichuan Basin, according to the geochemical characters of gases, condensates and source rocks in the area, in which natural gas belongs to a more typical type of coal-generating gas. Having made a series of comparison between gases, condensates and source rocks, we thought that the natural gas of Xiangxi formation in the south of this area partly comes from underlying Leikoupo formation.