Located about 120 km south of Hailar City in Hulun Buir League, the newly-discovered Honghuaerji scheelite deposit is the only scheelite deposit in central-northern section of Da Hinggan Mountains. The ore-bearing granites comprising monzogranites and quartz monzonite intruded into the Ordovician Luohe Formation (O_2-3lh). The LA-MC-ICP-MS zircon U-Pb dating results show that the reddish monzogranite was formed at 179.2±0.6 Ma (N=20, MSWD=1.3), the gray monzogranite was formed at 179.0±0.6 Ma (N=20, MSWD=0.7) and the quartz monzonite was formed at 178.6±0.7 Ma (N=20, MSWD=0.6). The high concordance of the dating results indicates that they were formed by magma activities in Early Jurassic. The inherited zircon (779.1 Ma and 463.2～486.0 Ma) has also been found in the three granites, which indicates that the Neoproterozoic and Lower-Middle Ordovician blocks are probably existent in the study area. The three granites have similar petrogeochemical characteristics. Geochemical analysis shows that all of the three rocks have high SiO₂ (63.09%～73.53%) and K₂O+Na₂O (7.60%～8.74%), and are slightly peraluminous (A/CNK=0.97～1.08). They are enriched in light rare earth elements and depleted in heavy rare earth elements [(La/Yb)_N=3.96～12.28] with a medium negative Eu anomaly (δEu=0.55～1.01). They are also enriched in Rb, Th, U, K, Pb and depleted in Ba, Nb, Ta, Sr, P, Ti. The analytical results of main and trace elements show that they are typical I-type granites. The ore-forming materials were mainly derived from the lower crust and also extracted from the tungsten-bearing formation by the magma.