The Bagenheigeqier ore deposit is located in the middle part of the Da Hinggan Mountains belt, which is a medium- sized Skarn- type Pb- Zn- Fe polymetallic deposit. The granite porphyry zircon U- Pb geochronology and geochemistry were studied in this paper. The granite porphyry’s zircon LA- ICP- MS U- Pb age is 150. 8±2. 2 Ma, which indicates that it is the product of magma movement during the Late Jurassic. The granite porphyry is characterized by high SiO2(70. 21%~72. 85%), is alkali- rich (6. 60%~8. 53%), has low P2O5 (0. 09~0. 11), with the A/CNK value of 0. 83~1. 35; the differentiation index (DI) is 85. 7~92. 8 and the solidification index (SI) is 3. 52~5. 80 which indicates that the granite porphyry’s crystallization differentiation is of higher degree. The geochemical features show the remarkable enrichment of some elements such as U, La, Hf, Yb, Lu, Rb, K and the depletion of elements such as Sr, P, Ti, Ta, Nb, Ba. The rare- earth element (ΣREE) is 127. 60×10-6~188. 33×10-6 (average is 159. 29×10-6) and the REE patterns show the “right type”, with moderately negative Eu anomalies (δEu =0. 57~0. 66), suggesting that it is quasi- aluminum to super- aluminum high- differentiation I- type granite. The (87Sr/86Sr)i value is 0. 70222~0. 70557, εNd(t) value is 2. 3~2. 5, εHf(t) value is 6. 2~9. 2, two stage Nd mode age is 741~755 Ma, two stage Hf mode age is 613~808 Ma, the corrected (206Pb/204Pb)t value is 18. 253~18. 396, (207Pb/204Pb)t value is 15. 521~15. 546, (208Pb/204Pb)t value is 37. 841~38. 066, and it has the characteristics of mixed source Pb, which indicates that magma originated by addition of the depleted mantle material to the crust in the Neoproterozoic. The granite porphyry magma and the Late Jurassic granite magma in the Da Hinggan area are basically contemporaneous emplacement, were perhaps formed after the closure of Mongol- Okhotsk Ocean related to the post- collision process, and influenced by the subduction of the Paleo- Pacific Plate caused tectonic back- arc extension. As the granite porphyry is unrelated to mineralization and ore body, future exploration work should be focussed on the diorite instead of the granite porphyry.