Abstract: After an entire metamorphic basement was formed during the Late Proterozoic era, 4 large tectonic cycles have happened in Jianghan Basin, i.e. Caledonian, Hercian-Early Indosinian, Late Indosinian-Early Yanshanian and Late Yanshanian-Himalayian cycles, which resulted in a three-storey-type tectonic framework, which was superimposed by the open-sea basin of platform type before the Indosinian, the foreland lake basin during Indosinian and the intracontinental fault-depression salt lake since Yanshanian. The complexity of the tectonic-evolutionary process of Jianghan Basin demonstrates this basin is a reformed basin. This tectonic-evolutionary process also resulted in a complexity of active evolution for the essential geological elements of reservoir formation in the study area. Therefore, the complex tectonic evolution controls oil-gas migration and accumulation; and this process endow marine strata of Jianghan Basin with several characteristics, i.e. the long time and large scan feature for the oil/gas migration and accumulation, and the complexity of the law of oil-gas migration and accumulation. The reformed basin has a variety of reservoir-forming patterns including the earlier hydrocarbon generation-earlier reservoir formation, the early hydrocarbon-generating and late reservoir-forming, the late hydrocarbongenerating and late reservoir-forming , and secondary mixed-source patterns.Meanwhile,the structural evolution controls the exploration direction and target. The region marked by the earlier hydrocarbon-generating and earlier reservoir-forming is the promising exploration target for choice.