In this paper, the geochemistry and zircon UPb isotope chronology of the monzonite granites in Yitulihe area in the north of Greater Xing’an Range is studied and their petrogenesis and tectonic signicicance are discussed. The results prove that the zircons from Yitulihe granites yielded a LA-ICP-MS U-Pb age of 123.3±0.8Ma, indicating intrusive time of the granites is the late early Cretaceous.The granites are rich in silicon, kalium and aluminum, A/CNK ratios ranging from 0.96 to 0.99.The trace elements are characterized by enrichment of LREEs relative to HREEs and enrichment of LILE such as Rb、K and HFSE such as Th、Ce、Zr、Hf, and poor Sr、P、Ti、Ba.These features suggest that the Yitulihe granites belong to aluminous Atype granite and have the characteristics of the shoshonitic rock, which representing the product of partial melting for the middle and lower crustal rocks and the period of magmatic emplacement events may occur in the late early cretaceous ancient eastern Pacific plate to Eurasian plate subduction of the backarc extension environment.