The Paleoproterozoic granite of Jiaobei terrane(northern part of eastern Shandong) is located in the south of Jiao—Liao—Ji(eastern Shandong—Liaoning—Jilin) belt. It is an important Paleoproterozoic orogenic belt in the eastern margin of the eastern continental block of the North China Craton. As one of the few Paleoproterozoic granites exposed in Jiaobei terrane, muniushan monzogranite in Xilaokou area is also the host rock of Xilaokou, Liaoshang, Guocheng and other large gold deposits, which has important research value. This paper discusses its formation age and genetic mechanism through rock geochemistry, zircon U- Pb chronology and Lu- Hf isotope analysis. It is found that the monzogranite is rich in silicon (SiO2=75.79%~76.10%) and alkali(Na2O+K2O=6.88%~7.18%), which is a quasi aluminous calc alkaline rock series (A/CNK value is 0.86~0.95); It enriches large ion lithophile elements (LILE, Rb, U, Pb), relatively loses high field strength elements (HFSE, Ba, Zr), and the rock 10000·Ga/Al value is 2.88~3.50, belonging to A- type intra- plate granite; The magmatic zircon in the rock mass has an obvious oscillatory ring structure, relatively lacks light rare earth elements(LREE) and gradually enriches heavy rare earth elements(HREE), with obvious positive Ce anomaly and negative Eu anomaly.The weighted average age is 2113±22 Ma,indicating that its emplacement time is Paleoproterozoic; The heavy rare earth elementsenrichment of metamorphic accretionary zircon is significantly higher than that of magmatic zircon in the core, and has stronger positive Ce anomaly and slightly weak negative Eu anomaly. The weighted average age is 1850±24 Ma,representing the age of metamorphic events in the region;εHf(t) value is -3.75~+5.17 and TDM2 value is 2450~2712 Ma.This rock mass has the same crustal evolution trend as the 2.5 Ga TTG rocks of Jiaobei terrane,indicating an origin by partial melting of Archean continental crust.