Abstract: In this paper tectonic evolution,framework and nature of the West Qinling Orogenic Belt after Phanerozoic Ph.have been discussed.Since about 800 MaP.B.,the West Qinling Orogenic Belt underwent break-up of supercontinent,evolution of ocean and continent,collisional orogeny,within-plate stretching and incontinental overprinted orogeny,and presentday West Qinling Orogenic Belt has been eventually completed.During diffirent tectonic evolutional stages,the West Qinling Orogenic Belt has various tectonic style and framewo rk.In the evolution stage of ocean and continent,its tectonic style belongs top late tec-tonics,and it is charecterized by framework of ocean and continent.In with in-plate stretching stage,its tec-tonic style belongs to a with in-plate rift and fault-subsiding basin,and it is charecterized by a framework of sea and continent.