The Heergetou area is located in the western part of the East Kunlun orogenic belt. There are a large number of granitic rock combinations. The study of the Late Triassic granites in this area not only helps to understand the Indosinian tectonic- magmatic evolution history of the eastern Kunlun orogenic belt, but also provides constraints on the subduction and the closing time of the Paleo- Tethys Ocean. This paper reports the LA- MC- ICP- MS zircon U- Pb dates, geochemical, and Sr- Nd- Pb isotopic results of granites in the Heergetou area. This dataprovides new information enabling establishment of a complete chronological framework and tectonic evolution of the study area.The zircon U- Pb age of the tonalite in the Heergetou area is 230. 9±0. 7Ma, which combined with the field contact relationships,indicates that the granites are the products of Late Triassic magmatic activity.The whole- rock geochemical analyses show that the Late Triassic granites in the Heergetou area lie in the middle- high K calc- alkaline fields.Theiraluminium saturation index shows metalumininous and weak peraluminous features, enrichments of LREE and LILE（Rb, Th etc.）, depletions of Nb, Ta, P and Ti（HFSE）and Eu negative anomaly indicating that they belong to the I- type granites. The Sr- Nd- Pb isotopicanalysis results show that the Late Triassic granites in the Heergetou area have high I Sr value (0. 705058~0. 707582) and negative ε Nd ( t ) value (-2. 05~-5. 14 ), with a two stage Nd mode age ( t DM2 ) of 1170~1422Ma, indicating that the magma was mainly derived from the crust. The corrected ( 206 Pb/ 204 Pb)i value is 18. 37949~18. 58525， the ( 207 Pb/ 204 Pb)i value is 15. 56543~15. 59755， and the ( 208 Pb/ 204 Pb) i value is 37. 79668~38. 27230. The Pb isotopic composition shows that the material source is related to the crust- mantle interaction. In combination with the geochemical characteristics and previous research, the granites in the Heergetou area show the characteristics of plate subduction stage, which may be the product of the subduction process of the Animaqing oceanic crust. The closing time of the Paleo- Tethys Ocean maybe postponed to the Late Triassic.