The southern Jilin district is an important place in the northern margin of North China Craton (NCC), where the Archean is exposed. In order to study the tectonomagmatic thermal event of the NCC during Late Archean and the formation and evolution of the Early Precambrian continental crust, this study chose TTG gneisses of the Jiapigou complex as the research objective. The results show that the gneisses are characterized by high Al (Al2O3=14.97%~16.28%) and high Na (Na2O=3.73%~4.54%), and poor Mg (MgO=1.96%~2.56%) with an average Mg index (Mg#) of 43; enrichment of LREE and depletion of HREE, without obvious Eu anomaly; enrichment of LILE {Sr(358×10-6~1114×10-6) and Ba (613×10-6~1200×10-6)}, and depletion of HFSE {Nb(6.39×10-6~11.2×10-6) and Ta (0.384×10-6~0.679×10-6)}, with low Yb (1.17×10-6~1.89×10-6) and Y (9.93×10-6~19.3×10-6) and very high Sr/Y ratio (36.0~57.7). These geochemical features show that the main residual phase contains garnet, amphibole and Ti-bearing minerals in the source, indicating that the gneiss should belong to the highpressure TTG series. LA-ICP-MS zircon U-Pb age data indicate that the rocks formed in the nearly 2509 Ma, suggesting that they were the result of the Late Archean. Combined with previous geochemical research of TTG gneiss and the data of Nd model ages, this period magma events may represent the remelting of older ancient crustal materials (~2.8 Ga). The study of petrography and zircon morphology shows that the area has experienced multiple metamorphism, among which the 2509 Ma high-degree metamorphism was coeval with magmatic event, likely related to underplating of mantlederived magmas in the setting of mantle plumes.