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Based on the field outcrop and drilling data, combined with the stratigraphic distribution and lithofacies associations of Sinian-Cambrian, it is proposed that “Chengkou-Badong-Wufeng” intracratonic rift develops in western Hubei-eastern Chongqing. The rift shows an “hourglass” shape, spreading from south to north with a width of 60-280 km from east to west and a length of about 400 km from north to south. The rift was formed in Doushantuo Period of Sinian, and developed in succession in Dengying Period. In the early stage of Early Cambrian, it was the peak period of rifting development, and it declined in the middle and late stage of Early Cambrian, and died out in the Middle Cambrian. Under the control of the evolution of the rift, there are thick and high quality source rocks in the Doushantuo Formation and Qiongzhusi Formation. The Dengying Formation and Longwangmiao Formation have high quality mound-shoal facies and grain shoal facies dolomite reservoirs on both sides of the rift, among which the Dengying Formation has a reservoir thickness of 55-100 m and the Longwangmiao Formation has a reservoir thickness of 22-57 m. It is pointed out that Wuxi-Fengjie area is located in the superimposed development area of mounds and shoals reservoir of Dengying and Longwangmiao formations, adjacent to hydrocarbon generation center, which is easy to form two effective accumulation combination, one is the side product and side reservoir migrates toward the sides, the other is lower product and upper reservoir migrates vertically. And it should be the target area for further exploration in East Sichuan. [ABSTRACT FROM AUTHOR]