In this paper, the authors studied the zircon U-Pb isotope chronology, whole rock geochemistry and Hf isotopes of the fine-grained two-mica monzonitic granite and medium fine-grained biotite granodiorite of the Lianyunshan granite from the Jingchong Co-Cu polymetallic deposit in northeastern Hunan Province. LA-ICP-MS zircon U-Pb dating yielded crystallization ages of 149.4±1.1 Ma for the fine-grained two-mica monzonitic granite of the Lianyunshan granite. The rocks belong to a peraluminous high-Al calc-alkaline intrusive granite. These rocks are characterized by high Th, U and Pb content and low Nb, Ta, Zr and Ti content. The REE distribution patterns show the right-inclined type, with strongly negative Eu anomalies to weakly negative Eu anomalies. The Hf isotope analytical results show that the ¹⁷⁶Hf/¹⁷⁷Hf values of the Yanshanian zircons are between 0.282 314 and 0.282 461, whereas the εHf(t) values of the late Yanshanian zircons are between -13.0 and -7.8, with the two stage Hf model ages ranging from 2 018 to 1 690 Ma, which indicates that its parental magma was derived from partial melting of rocks of ancient crust.