East Siberia Basin and Tarim Basin are all ancient craton basins where a series of oil-gas fields have been found, with different scales and reserves. The study shows that the subsalt carbonate rocks of Cambrian in Tarim Basin possess favorable exploration prospect, the favorable areas or zones are located in the main host belts of Tazhong uplift and its two sides, Yingmaili and Lunnan areas in Tabei uplift and southern structural belt of Bachu swell, based on the source-reservoir-cap rock assemblage, structural development, sedimentary environment, oil-gas shows and the petroleum accumulation characteristics of the two basins.