Abstract: Bashenerxi granites of the western sector of Qimantage mountains consist of two rock types of adamellite and moyite,magmatic sequence includes sixunits from early to late,its age is about 458-432 Ma; tectonic discrimination shows Bashenerxi granites formed in the post-orogenic tectonic setting; through discussions that Ordovician-early Silurian A₂ (PA)-type granite of metaluminous-peraluminous in the south side of Altun fault is the focus of the exploration target of W-Sn deposit in.