The Jiaodong Peninsula is the most important pool of native gold ore deposits in China, which is mostly controlled by Granite. In this paper, we discuss the genesis and material source of gold deposit by study the geochemistry and geochronology characteristics of the Guojialing Granite. Two granite plutons of the Guojialing Granite are studyed in this paper, which are the Shangzhuang pluton and Guojialing Pluton. This dissertation presents a combined study of petrography and mineralogy, whole rock major, trace elements and U Pb isotopes for granite of these two plutons, to obtain some recognition of the genesis, material source and presence of natural gold for Mesozoic magmatic rocks in the Jiaodong Peninsula. LA ICPMS zircon U Pb dating yields Early Cretaceous age of 125.4±2.2Ma for the Gguojialing pluton, and also Early Cretaceous age of 128.8±2.0Ma for the Shangzhuang pluton, with an age difference of 3Ma. From the perspective of age, these two plutons all belong to Guojialing granite with the same intruding period. Granite of the two plutons contain inherited zircons with Archean and Late Jurassic ages, indicating similar material sources containing components of both Archean rocks and Late Jurassic granite composition. The Guojialing and Shangzhuang plutons have similar distribution patterns of REE and trace elements, with LREE and LILE enrichment but HREE and HFSE depletion, slightly negligible Eu anomalies. Both of them have high Sr, low Yb and Y contents corresponding to high (La/Yb)N and Sr/Y ratios, resembling to normal adakites. This indicates the presence of garnet with none Plagioclase as residual phases during partial melting.They Both have relatively low MgO, Cr, Ni contents and thus low Mg#. All these results indicate that Guojialing Granite is formed by partial melting of basaltic rocks of oceanic crust with the presence of granet as residual phase in the island arc environment.