Based on the analysis of the sedimentary facies, sequence, the surface section, drilling cores and the well logging data in Sichuan Analogous Foreland Basin, combining with the regional geological setting and oil and gas geologic characters, the sedimentary sequences，the filling patterns and the oil-gas distribution Rules of the Xujiahe Formation have been discussed. The Xujiahe Formation is divided into 2 super long-term sequence cycles（SLSC1, SLSC2）and 5 long-term sequence cycles（LSC1～LSC5）, which correspond to lower and upper the Xujiahe Formation of the coupling process between basin and mountain, and 5 regional lake transgression-lake regression sedimentary cycles respectively. On the basis of above, choosing the rising and falling base-level phases of each long-term sequence cycles as a unit，the sequence-based lithofacies and paleogeography maps of the Xujiahe Formation have been mapped. The results indicate that the subsidence-sediment center of Members 2 and 3 of Xujiahe Formation is located in West Sichuan Depression, while Members 4 has a migration to northeast Sichuan, Member 5 to 6 have been distributed in northeast Sichuan depression; As for the different tectonic-deposition evolution stages, the filling patterns and oil and gas distribution Rules of frontal depressions are varied; With the migration of the subsidence-sediment center of the lower and upper Xujiahe Formation and the excellent source-reservoir-cap rock assemblage from west to northeast Sichuan depression, the oil and gas distribution have also migrated from south to north and then coming to northeast, and developed surrounding the foreland palaeohigh area.