LAICPMS UPb isotopic dating for zircon separated from the Haergentoukoubu granites yields two ages: 387.6±8.2Ma and 1172±7Ma. These granites were emplaced in the Changcheng System, Jixian System and Silurain System in Huoshishan, Beishan, Gausu. The former probably represents intrusive age (earlymiddle Devonian)of the granites and the latter probably represents the age of late Jixian System inherited zircon inside the granites. Composed mainly of moyites,monozogranite,granodiorite, the granites are characterized by high SiO2 (70.28％~79.4%), and high Na2O + K2O (6.52%~9.11%), low Al2O3 (8.82%~14.05%), and low Sr (40~150×10-6，averaging 101.5×10-6). Trace elements analysis shows that the average ΣREE is 168.52×10-6，the ratios of LREE/HREE and LaN/YbNare 2.89~16.4, 1.82~25.18 respectively. The REE distribution patterns show that the granites are enriched in Rb, Th Ce and Sm, and depleted in Eu, TZ, Nb, Zr and Hf, with LREE/HREE=2.89~16.4, LaN/YbN= 1.82~25.18. The comprehensive analysis also suggests that the granites are metaluminous to slightly peraluminous calcicolous alkaline series rocks, which formed in the tectonic setting of transformation from collision to extension in earliermiddle Devonian.