There exist a large scale gravity-slide tectonics in the Niger Delta located on the eastern passive continental margin of the South Atlantic Ocean. From the African Continent to the South Atlantic Ocean, the gravity-slide tectonics can be divided into the front compressional deformation province and the trail extensional deformation province. The front compressional deformation formed a fold-thrust belt. The trail extensional deformation formed horst-graben structures. The detachment folds are well developed in the transitional zone between these two deformation provinces. The delta sequence was formed in Eocene-Quaternary, constituted with the marine shale （Akata Fm.）, paralic sand and shale （Agbada Fm.） and continental alluvial sands （Benin Fm.） from the bottom to the top. These three lithostratigraphic units are diachronous. All of them are younger seaward. The main detachment fault of the gravity-slide tectonics lies in the Akata marine shale. According to the growth strata, unconformity and the age of the strata involved in the deformation, the gravity-slide deformation onset at 12 Ma. Accompanied with the gravity tectonics, shale tectonics are widely developed in the Niger Delta. There is possibly some relation between the gravity-slide tectonics and the Cenozoic volcanic activities of the Cameroon volcanic line.