With the ongoing discovery of giant offshore oil and gas fields in Brazil and West Africa and the progress of salt related exploration technology,there has been a rapid accumulation of data. This data is of great significance for the development of basic geological theory and the exploration and development of marine oil and gas, and in undertaking intensive research on the genetic environment and deformation mechanism of the Lower Cretaceous salt deposits in the passive continental margin basin of the South Atlantic Ocean. The lower Cretaceous Aptian salt tectonics in the passive continental margin basins on both sides of the South Atlantic Ocean has obvious zonation characteristics, showing the continuous transition from extension to contraction. On the Brazilian side, there are continuous distribution of thick salt deposits, and the strata above and below the salt deform harmoniously. The tectonic deformation of salt began in the Albian when the oceanic crust appeared. The growth of the negative terrain space of the new seafloor triggered the tectonic deformation of salt under the action of sedimentary load during the drift period. With the deposition and subsidence of the passive continental margin, the uplift of the two sides of the land (mantle action), and the long- distance transfer of tectonic stress on the plate boundary (South America), the tectonic deformation under gravity continued in the Neogene. The physical simulation experiment and the discrete element numerical simulations show that the salt tectonic deformation in the South Atlantic is caused by gravity tectonism, and the gravity on the slope forms the extension transition compression salt tectonic zoning of the passive continental margin basin. Local uplift (passive continental margin fault block uplift) disturbs salt flow as salt particles have a large upward velocity component, forming salt plant and salt diapir structure. The front tectonic barrier (caused by the uplift of oceanic crust, SDRs formation, transitional extensional crust, exposed ultramafic mantle, etc.) and the formation pressure (load) above the salt are the main reasons for the decrease of the movement rate of salt rock below the slope and the phenomenon of accumulation and thickening. The salt tectonics on both sides of the South Atlantic Ocean experienced multi- stage tectonic deformation, mainly involving two stages (Albian and Cenozoic) of salt tectonic deformation and flow and its forward spreading to the ocean basin. The mixed action mode of gravity sliding and gravity expansion during the process of sliding along the salt layer can explain the main salt structure style in this area.