Abstract: Geological survey and geophysical interpretation revealed that the Late Triassic foreland basin in western Sichuan was involved in intraplate deformation as a result of squeezing activity in Longmenshan area.Due to its richness in hydrocarbon in the Late Triassic,the deformation age,characteristics and mechanism of the Late Triassic foreland basin were analyzed in detail,and the relationship between structural deformation and hydrocarbon accumulation was especially high lighted.In accordance with analysis three different gas-bearing structures developed in the foreland basin,the principal facters for hydrocarbon accumulation was discussed,and the favorable targets for gas exploration were proposed.