| Sichuan basin, which is about 250,000 square km, is in the east of Longmenshan, in the west of Qiyueshan, in the south of Dabashan and in the north of Daloushan. Tectonically speaking, it belongs to Yangtze plate.On the basis of previous studies, this article concentrates on the structural evolution in Mesozoic and Cenozoic as well as the process of tectonism in Sichuan basin. The basement and stratigraphic structure were studied in this paper by the aeromagnetic and gravity data,seismic data and DEM data,ESR age data. Electromagnetic data,remote sensing data,GPS monitoring data,drilling data and geological section were used in the research of the structural evolution of longmenshan. By the analysis of the formation and structural evolution of Sichuan basin, the dynamic environment of the evolution of Sichuan basin is: extensional (Z-P) to transition (T-J) to extrusion (K-Present). The basement of the central Sichuan basin is relatively hard; the deformation of the entire marine layers is weak; the horizontal and vertical continuity of layers is very good. The central area of Sichuan basin which is characterized by the low-micro range of fold structural style, was cut by seldom faults during the multi-cycle reconstruction. There are many box-folds in the superficial cover layer, this article concentrates on the process of tectonism, and then the slip zone. The key to the studies of oil and gas resources, tectonic theories and model and other theories is the research about the basin- mountain system. At the end of the article, the basin-mountain coupling theory was used to summarize the structural deformation and tectonism in the Mesozoic and Cenozoic of Sichuan basin. In a word, the focus of this article is the tectonism in the Mesozoic and Cenozoic of Sichuan basin, by the study of macro and micro structural evolution stage and the modeling of some tectonism, the reconstruction and the deformation in indosinian-yanshan-himalayan stage of Sichuan basin is clear to see.
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