Zircon U-Pb dating and geochemical characteristics of Late Devonian Baogede granite in the southern part of the Xing'an block were studied and its petrogenesis and geological significance were discussed in this paper. The rocks are composed of quartz monzonite, monzonitic granite and granite porphyry. Zircon U-Pb dating results of syenogranite and alkali-feldspar granite are 368±1 Ma, 364±1 Ma and 355±1 Ma respectively. indicating that they are the products of magmatic activity in the Late Devonian to Early Carboniferous period. (Na₂O+K₂O)=7.62%~8.82%, K₂O/Na₂O=0.93~4.21, characterized by full high alkali content and high potassium. A/CNK=0.95~1.20, suggesting metaluminous to weakly peraluminous rocks. They belong to the high-K calc-alkaline series I-type granites. They are low in total REE (83.60×10^-6~163.40×10^-6), and the negative europium anomaly is medium (δEu=0.34~0.78). They are rich in large ion lithophile elements (Rb, Th, K) and light rare earth elements, and have suffered from different degrees of loss of Ba, Sr, P and Ti elements. The Baogede granite was formed in an extended environment of the active continental margin, and ts formation was related to the Paleo-Asian Ocean.