Abstract: China’s onshore oil/gas exploration domain has been changing a lot in the past decade. Before the advancement of “sag-wide oilbearing” theory, “secondary tectonic belt” was the major domain of exploration. After that, the domain has been transferred to hydrocarbon rich depressions. Besides, breakthrough has been made in high mature and overmature strata of deep superimposed basins, based on the theory of “successive generation of natural gas from organic materials”. So high mature and overmature strata became the major substitute area of reserves growth in the future. Future onshore oil and gas detection will lay equal stress on the structural reservoirs and lithologic stratigraphic reservoirs, the deep and mid-shallow layers, and the conventional and unconventional oil/ gas resources. Sustained innovation of oil/gas accumulation theory and steady progress of engineering technology will still be the key to realizing stable growth of oil/gas reserves