Lying in the Western Kunlun area of Xinjiang, Bayankala folded fault belt in the south margin of Kangxiwa fracture zone hosts a Mesozoic granite belt from Sanshiliyingfang to Quanshuigou, in which the Dahongliutan pluton is one of typical granitoids. The pluton is composed mainly of the medium-fine grained monzogranite. Combined with the cathodolumine scence (CL) images and element U and Th features of zircon, this study yielded an age of 220±2.2 Ma ~217.4±2.2 Ma for the pluton using the SHRIMP zircon U-Pb dating, indicating the Late Triassic. Monzogranite has accessory minerals such as garnet and tourmaline. The geochemical analysis show that the pluton is characterized by high SiO2 (71.77%~74.20%), high potassium (K2O=3.03%~5.30%, Na2O+K2O = 6.18%~8.02%), and high aluminum index A/CNK (1.20~1.59), belonging to high-K peraluminous calcic-alkaline series. The pluton is enriched in LREE, depleted in HREE ( LREE/HREE =10.21~11.82 ), with obviously negative Eu anomaly ( δEu= 0.25~0.44) . While the trace elements are characterized by Ta, Hf, Rb, Th, U enriched, and Ba, Sr, Ti, Nb, Zr depleted, as well as with high differentiation index (DI = 89.40%). The chemical signatures indicate the pluton experienced the highly fractionated process of evolution , and belong to highly fractionated S-type granite. In discrimination diagrams, all the samples show geochemical characteristics of syn-collision granitoid . In the Late Triassic, the Paleo-Tethys Ocean was gradually evolved from subduction toward north to the complete closure, and at the same time regional tectonic stress was transformed from subduction process to collision compressional action environment. Based on comprehensive analysis of the genetic type of the pluton and evolution of regional tectonic environment, we suggested that the Dahongliutan pluton formed just after this tectonic stress transfrom , which shows that this area was in continent-continent collision orogenic regime in the Late Triassic.