Abstract: This paper discusses four basic concepts of the geotectonics in Sichuan: the tectonic units, major deep fracture systems, megastages of geotectonic evolution and model of geotectonic evolution. Sichuan extends across the Yangtze paraplatform and the Songpan-Ganze, Sanjiang （Three-River） and Qinling fold systems, which involve twelve Ⅱ-order, Twenty Ⅲ-order and forty-two Ⅳ-order tectonic units. The Authors also describe seventeen major deep fractures that play a special role in the geotectonic evolution of Sichuan. The Jinningian, Indosinian and Himalyan tectonic movements are the most important in the time sequence of the geotectonic evolution of Sichuan. The authors for the first time propose a scheme of three-episode division for the Indosinian and Himalayan movements. With regard to the space sequence of the geotectonic evolution of Sichuan, it is pointed out that: in the Proterozoic the development of the trench-arc-basin system resulted in the formation of the Yangtze paraplatform, that in the Paleozoic the disintegration and dispersion of the margins of the Yangtze paraplatform gave rise to a miogeosyncline, that the trench-arc system derived by back-arc spreading in the Permian-Triassic was a local phenomenon in the entire Tethyan tectonic evolution and that the mechanism of thin-crust collision represented by the Longmenshan nappe after the Indosinian movement was the dynamic factor for the formation of the Sichuan basin.