The Jiaodong ore concentration area is a globally famous gold resource base. By 2019, the total gold resource reserves had reached 5000 tons. The Mesozoic granite widely distributed in the area has a close temporal and spatial relationship with gold deposits. By using high- precision gravity and magnetic, CSAMT and other geophysical methods, the predecessors believe that there may be concealed Guojialing granite in the deep part of the Jiaojia and Zhaoping metallogenic belts. The concealed Guojialing granites in the three main gold metallogenic belts in Northwest Jiaodong revealed by drilling in recent years are characterized by high Na2O+K2O (5.80%~11.27%), Al2O3 (14.01%~16.36%), high Sr content (632×10-6~1224×10-6), Ba content (1641×10-6~3512 × 10-6), high Sr/Y ratio (185~435), CaO (1.25%~2.44%) and TiO2 (0.077%~23%), MgO (0.17%~0.84%), total Fe2O3 (0.67%~1.94%), Rb (46×10-6~110×10-6), belonging to high potassium calc- alkaline series. The A/CNK of the rocks is generally 1.01~1.06, which is located in the weak peraluminous region. There are positive Eu anomalies and weak negative Ce anomalies. Trace elements are characterized by enrichment of LILE such as Ba, K, Rb, Sr and Pb, and depletion of HSFE such as Ta, Nb, P and Ti. Zircon SHRIMP U- Pb ages of the porphyry medium grained monzogranite in the northern Sanshandao and Jiaojia gold belt are 126.10±1.00 Ma and 127.59±0.85 Ma, respectively. The zircon εHf(t) values range from -27.94 to -18.59, and the two- stage Hf isotope model ages range from 2.95 Ga to 2.36 Ga (mean 2.47 Ga). The samples are distributed in the crust source area below the chondrite evolution line, and the magma source area is consistent with the fall point of the Guojialing pluton. Combined with petrochemistry, it is considered that the Guojialing granite exposed by drilling has the characteristics of both crustal material source and mantle material addition, which is the result of mixing of continental crust acidic magma and mantle derived basic magma. According to the information derived from the drilling projects and dikes, it is considered that there are Guojialing granite in the footwall of the three main ore controlling fault zones in the northwest of Jiaodong. Meanwhile, it is speculated that there may be the Guojialing granite in the three main ore controlling fault zones in the northwest of Jiaodong, Qixia area and the deep part around Rushan City. This provides a new understanding of the distribution pattern of the Guojialing granite in Jiaodong area, and provides a basis for further study of the internal relationship between the Guojialing granite and gold mineralization.