The Early Cretaceous intrusive rocks in the Nyainqentanglha area are mainly consisted of granodiorite and quartz diorite．The zircon LAMCICPMS UPb dating for defines a crystallization age 133.20±0.92Ma of the granodiorite is the same as that of the quartz diorite．The granodiorite is riched in Si and K，poored in P，belongs to metaluminous to weak peraluminous, highK calcalkaline series，has average magnesium index of 40 and Nb/Ta ratio of 10.3，\[n(87Sr)/n(86Sr)\]i of 0.71947～0.72503，εNd(t) of -12.6～-12.7，tDM of about 1927Ma，and the highest magma temperature to 830℃ calculating by concentration of zirconium in wholerock and zircon; which indicate the granodioritic magma is mainly originated from partial melting of ancient crust relating to underplating of mantlederived magma．Quartz diorite is poored in Si and alkalinity，riched in Mg, Fe and Ca，belongs to metaluminous，calcalkaline to shoshonite series，has Nb/Ta ratio of 20，Sr/Y ratio of 9; which indicate quartz–dioritic magma originated from partial melting of mantle．Both granodiorite and quartz diorite are LREE rich, HREEdepletion，weak to medium Eu negative anomaly．And both of them have higher LILE concentrations, lower HFSE abundances, showing the same distribution characteristics of trace elements; which are similar to calcalkaline rocks in island arc or active continental margin．The granodiorite and quartz diorite may be derived form the same magmatic processes．Quartz diorite originate from crystallization differentiation of mantle source magma assimilating and contaminating some crust materials；while granodiorite originate from crystallization differentiation of massous crust sourced magma mixing some mantle sourced magma．Connecting with the predecessors research results, it can be supposed that the petrogenesis may be related to the subducting towards north of NeoTethyan．