Abstract: Thermochronology researches in the orogens and apatite fission track analysis in the basin suggest that three NEtrending anticlines (Tongziguan anticline, Jiulongshan anticline and Nanyangba anticline) in the NW margin of the Sichuan Basin were formed in the Cenozoic. Based on the field observation, the Hanzhong Basin to the north of the Sichuan Basin is a Quaternary pull-apart basin, and its major faults are sinistral strike-slip ones. When the large blocks of the eastern Tibetan Plateau extruded eastwards in the Cenozoic and encountered the rigid Sichuan Basin, a transpressional belt was formed along the Longmenshan Mountain. It affected the northwestern Sichuan Basin, resulted in formation of three NE-trending anticlines. It also further extended northeastwards into the Micangshan Mountain, forming several NE-trending reverse faults. The eastward extrusion of the Tibetan Plateau also took place north of Sichuan Basin, which matches with the sinistral strike-slip property of the faults controlling the Hanzhong Basin. The eastwards extrusion of the Tibetan Plateau also affected the arcuate Micangshan Mountain,which led to another SSE-ward deformation affecting the northwestern Sichuan Basin. The deformation superposition induced the deflexing the axis of Nanyangba anticline relative to the other two anticlines.