The Langqiao granodiorite intrusion is a complex pluton with melted crust mantle materials, located in the northern margin of the fold belt in Jingxian county of South Anhui province. The U Pb dating results for zircons from two granodiorite samples formed in main forming stage of the Langqiao intrusion and one porphyry granite samples from the vein rock formed at the later forming stage yielded weight average ages of 135 6±1 8Ma, 137 6±2 0Ma, 136 4±1 9Ma, respectively, indicating the intrusion formed in the Early Cretaceous. The zircon Hf isotopic analysis suggested that this intrusion was formed by partial melting of Mesoproterozoic crustal materials, contaminated by a small amount of Paleo proterozoic crutal materials. The “zircon saturation temperature” calculated by whole rock Zr contents show the magmatic crystallization temperature of Langqiao granodiorite intrusion and porphyry granite from vein rock is 749~781℃, 722~745℃, respectively, indicating rapid cooling history of magma; the element geochemical studies show that the intrusion formed accompanied with fractional crystallization of plagioclase, K feldspar and the accessory minerals, such as apatite, ilmenite. Zircon Ce(Ⅳ)/Ce(Ⅲ) ratios suggest the high oxygen fugacity in the magmatic process is conducive the Cu Au mineralization, while the fractional crystallization of plagioclase reduced Eu N /Eu N * to 0 2~0 4. The Langqiao intrusion is enriched in large ion lithophile elements, Pb, depleted in high field strength elements (Nb, Ta, Zr, Ti), also has obvious differentiation between LREE and HREE, with more enriched LREE than HREE, similar to the arc magmatic rock; tectonic setting discrimination diagrams suggested the formation of Langqiao intrusion was closely related to the subduction and collision of the Paleo pacific plate towards the Euroasian continent.