Abstract: The Mesozoic Foreland Basin in West Sichuan area is controlled by Longmenshan orogenesis.In the transgressive overlap sedimentary sequences of medium-deep strata such as the Shaximiao Fm.,the Qianfuya Fm.,etc.,a great amount of favorable facies zones which are advantageous to the accumulation of natural gas are developed.They are distributed in the relatively stable slope regions within the Foreland Basin which are controlled by the paleouplift.There will become the new field of natural gas exploration in West Sichuan area.