There were multiple episodes of magmatism in the Southern Da Hinggan Mountains during the Late Jurassic to Early Cretaceous, and an in-depth study of the petrogenesis and evolutionary process is of great geological significance to reveal the Mesozoic geodynamic background and mineralization. In this paper, LA-ICP-MS zircon U-Pb dating and whole-rock geochemistry for medium-grained adamellite, fine-grained adamellite and granite pegmatite in Hailiute area were carried out. The zircon ²⁰⁶Pb/²³⁸U weighted average ages of the medium-grained adamellite, fine-grained adamellite and granite pegmatite are 142.0±0.7 Ma, 141.2±1.1 Ma and 139.7±2.4 Ma respectively, belonging to the Early Cretaceous. They have high SiO₂ and total alkali contents, and their A/CNK value is 1.01~1.18, with an average value of 1.09, which is weak peraluminous. They are characterized by enrichment of large ion lithophile elements such as Rb, Th and K and depletion of high field strength elements including Ba, Sr, P and Ti, with extremely negative Eu anomalies (δEu=0.012~0.040). The Zr+Nb+Ce+Y value of them is between 38.25×10^-6 and 258.2×10^-6, less than 350×10^-6. The zircon saturation temperature of them is 723℃ to 778℃. The primary muscovite and alkaline-mafic minerals are not found among them. The magma experienced the fractional crystallization of plagioclase and K-feldspar during its evolution. The Zr/Hf, La/Ta and La/Nb of them are lower than the range of normal granite, however Nb/Ta and Y/Ho of them are in the area of normal granite. The parameters of tetrad effect of rare earth element (TE_1,3) of them is between 1.18 and 1.34, greater than 1.1. In conclusion, the Hailiute granite belongs to early Cretaceous highly differentiated I-type granite. It has weak interaction between melt and fluid in the process of crystallization differentiation, which can promote the formation of tungsten, tin and rare metals minerals.