///The geology and geochemistry of the late Yanshanian granitoids in the Duoba-Bange area are systematically studied. The results indicate that the rock association of Early Cretaceous granites is tonalite-granodiorite-monzonitic granite, it is the metaluminous-peraluminous and high-K calc-alkaline I-type with weak fractional crystallization of plagioclase, high content of Rb, Th, Ce, Hf and low content of Ba, Nb, Y, and the product of amphibolic fractional melting, which forms in the volcanic arc. The analysis of the type of granites, the degree of compositional evolution, differentiation degree and oxidation state in the study area show that the Early Cretaceous granites are with lower SiO₂ content and composition evolution, moderate differentiation, ilmenite series, and the metallogenic potential types are the Fe-Cu-Au deposits.