There are plenty of Late Paleozoic Mesozoic plutons outcropped in the southern margin of the eastern part of the East Kunlun Orogenic Belt, and their genesis and features of source region have long been the hot topic among geologists. This study carried out the detailed investigation over petrography, LA ICP MS zircon U Pb chronology and litho geochemical characteristics for the Helegang Xilikete plutons in the area. The results show that the plutons are characteristic of high Sr/Y and La/Yb ratios, high Na2O and Sr contents, apparent differentiation between LREE and HREE, slight positive and negative anomalies of Eu, and low contents of Yb and Y. All this features indicate that the plutons are similar to adakitic rocks. The rocks are classified to metaluminous or weak peraluminous high K calc alkali granitoid and enriched in LILE and depleted in HFSE, with high Mg# and Cr, Ni in content, and Nb/Ta value similar to that of continental crust. In addition, the rocks contain a lot of mafic enclaves and dark micro grained enclaves indicate they were the product of underplating of basaltic magma into lower crust. The zircon isotopic age of the plutons is about （225±5）Ma, representing their forming age. In combination with geochemical features, the age may imply that the eastern part of East Kunlun Orogenic Belt stayed in the transitional period from collision to post collision at that time.