Abstract: The basin and range tectonics in both western North America and Southeastern China are a distinctive geologic and geomorphologic scene.Their formation and evolution possess profound geologic settings and tempral-spatial-material conditions. This paper studies the geologic setting, tectonic units and tectono-magmatic assemblages, basement and deep-seated structures, temporal-spatial relation, formation mechanism, coupling patterns and evolutional history of basin and granitic ranges in these two regions, analyzes the geometry, petrography, geochronology and petrogenesis of metamorphic core complexes in the two basin and range regions. Our studies suggest that some principal similarities occur in the basin and range zones on both sides of Pacific Ocean, including（1）Two regions belong to Pacific tectonic regime during Mesozoic-Cenozoic and are controlled by Pacific system;（2）The beginning time influenced by Pacific plate subduction is the same, the Middle Jurassic,with close width of active continental margin;（3）The time of subduction angle change from gentle to steep is the same, about 100 Ma, which further caused back-arc extension-collapse tectonics and lithospheric thinning; (4) The Cordilleran-type extensional tectonics and metamorphic core complexes are developed well in both regions; (5) The extensional basins and granitic ranges in both sides of the Pacific share similar forming geotectionic setting,their spatioal coupling and genetic relation. At the same time, some differences exist in these two regions, including (1) difference in magmatic assemblages; (2) difference in forming age of basin and range tectonics; (3) difference in activity of mantle plume; (4) difference in migration of subduction zone; (5) difference in solidification degree of basement and metamorphic core complexes .