Abstract: The Sichuan Basin can be divided into the high-scarp structural zone in east and south Sichuan,the flattish and low-flattish structural zone in central Sichuan and the low-flat-tish and scarp structural zones in northwest Sichuan depending on the structural types.In the basin,the thick sequences of Sinian-Middle and Lower Triassic systems deveploped mainly with marine carbonate rocks and the Upper Triassic-Middle and Lower Jurassic non-marine sequences.In these sequences,the commercial oil/gas has been discovered with various types of oil/gas pools and the unique characters respectively.Up to date,however,it is proved that the Sichuan Basin is one of the most important natural gas production areas in China with bright oil/gas prospects.