Objectives:Based on Petrology study and method of zircon LA-ICP-MS age dating and geochemistry, to explore the Middle Triassic Granites petrogenesis and tectonic implications in the Zhongzaohuo Area, East Kunlun. Methods:Calculate the age of granites by zircon UPb dating and their petrology characteristics by whole rock analysis. Results: Plutons in the Zhongzaohuo area consists of quartz-diorite, granodiorite and monzogranite were emplaced in Middle Triassic as demonstrated by the ca. 243 Ma zircon crystallization age for both the quartz-diorite and monzogranite units. These rocks have varying SiO2 contents, moderate to high Al2O3 and total Alkaline. They are middle—high potassium series, meta-aluminous granotoids. The geochemical and petrographic features indicate those rock suits are I-type granite. This rock assembly shows enrichment of LREE and highly incompatible elements but depleted in high field strength elements typical of continental arc. The consistent linear variation between silica and other major elements and the gradual transition rather than intrusive and sharp relationship of the suites indicate an important role of fractional crystallization for the composition variation of the granotoids. Parental magma was formed by partial melting of crustal materials that heated by underplating of basaltic magma represented by gabbro in the adjacent region. Conclusions: During the subduction of the Paleo-Tethys, mantle derived melt intruded into lower or middle crutal resulted in partial melting of crustal components. Different degree of crystallization differentiation of parental magma that generated by processes of mixing or mingling of crust—mantle derived melt has contributed to the genesis of the quartzdiorite, granodiorite and monzogranite suites.