The Zongwulongshan tectonic belt is located on the northeast edge of the Qinghai Tibet Plateau and is an important geological structural unit that connects the East Kunlun orogenic belt and the South Qilian orogenic belt.The results show that in recent years, the 1∶25000 regional geological and mineral surveys conducted in the region have made significant breakthroughs in lithium beryllium deposits, greatly enhancing basic geological research and exploration space.This article uses petrology, mineralogy, whole rock geochemistry, LA- ICP- MS zircon geochronology, and Lu—Hf isotope methods to study gneiss like diorite.The results showed that a total of 29 zircons identified 3 different age values:(1)There are eight measurement points with n(206Pb) /n(238U) concordant age data ranging from 563.4 ± 9.7Ma to 1116.6 ±11.0 Ma, representing the captured surrounding rocks or inherited early magmatic crystalline zircons during the intrusion process of the rock mass.(2) There are four measurement points,which represent the early magmatic events of the Early Paleozoic era. The n（206Pb）/n（238U）concordant age of zircons ranges from 521.1 ± 8.7 Ma to 534.6 ± 4.4 Ma, representing the captured or inherited early zircon ages.(3) There are sixteen analysis points with a concordant age value of n(206Pb）/n(238U）, which is 512.9 ± 1.2Ma (MSWD)=0.80,n=16), indicating the crystallization age of the rock mass and representing the intrusion age of the rock mass in the Middle Cambrian. The Hf isotope results indicate that εHf(t) varies between -3.03 and -18.03, with an average value of -9.61. The two- stage model age (TDMC) ranges from 1678 Ma to 2617 Ma, suggesting that the granite originated from the remelting of ancient crust. The rock is relatively enriched in light rare earth elements and relatively depleted in heavy rare earth elements. The rock mass is characterized by high Si and Y, rich in Na2O+K2O, poor in Ca, low in Fe and Mg, and strong depletion of Sr, Eu, P and Ti, belonging to a typical A- type granite. Based on the comprehensive analysis of regional geological background, we believe that the gneiss like diorite in this area was formed in an active continental margin arc extensional environment where the original Tethys Ocean subducted southward. This discovery is of great significance for inverting the early Paleozoic tectonic evolution of the Zongwulong structural belt.