Abstract: Oil/gas resources is rich in marine strata in China, due to the evolution history of complicate tectonics and the variation of thermal system, the features of formation and accumulation of marine oil/gas reservoirs are relatively complicated. The variation of geotemperature field would result in the multistage hydrocarbon-generating of source rocks;Multistage tectonic movements result in the multistage reservoir-forming and adjustment, reconstruction and damaging; During the later period, strong tectonic deformation made the marine oil/gas reservoirs generate very late. The favorable tectonic positions such as marine paleo-uplift, promising reservoiring belts and paleo-fault belts, are regarded as the main areas for exploration.