Abstract:The polymetallic metallogenic belt from Fushan—Qixia is an important polymetallic mineral distribution area in Jiaodong Peninsula, and the mineralization is closely related to the ultra- hypabyssal acidic granodiorite porphyries. Methods: The study on the formation age, genetic mechanism and tectonic setting of these granodiorite porphyries and the relationship with Guojialing granite closely related to gold deposit is still weak. In this paper, Xiangkuang granodiorite porphyry and Yanghushan granodiorite porphyry are selected to carry out petrology, petrochemistry, chronology on the basis of systematic field geological survey. Results:The results show that the weighted average ages of zircon LA- ICP- MS U- Pb in Xiangkuang granodiorite porphyry and Yanghushan granodiorite porphyry are 127. 9±0. 6 Ma and 125. 6±0. 8 Ma, belonging to the Early Cretaceous. The SiO2 content of granodiorite porphyry is 62. 28%~68. 59%, the total alkali content is 5. 50%~9. 30%, the Rietman index is 1. 33~3. 38, the Al2O3 content is 13. 52%~14. 97%, the P2O5 content is 0. 06%~0. 14%, the TiO2 content is 0. 18%~0. 6%, and Mg # is between 30. 35~56. 70. Light rare earth elements are relatively enriched with insignificant negative Eu anomaly. Large ion lithophile element Rb is enrichment and high field strong element Nb, Ta are loss. Conclusions: The rock type belongs to I- type granite and also has the characteristics of adakitic rock. The granodiorite porphyry has a consistent diagenetic age, similar geochemistry and Sr and Pb isotope ratios with Guojialing granite, which is closely related to gold deposits, reflecting that the granodiorite porphyry should be the shallow facies of the Guojialing magma. The formation of magma in this period is related to the double tectonic settings of thickened lithospheric delamination in late collisional orogenic stage between Yangtze Plate and North China Plate, and subduction of the Pacific Plate.