The Halahei stratigraphic cross-section, that is previously identified as Permian Linxi Formation and Jurassic Baiyingaolao Formation, located in the Horqin Right Front Banner, Inner Mongolia, central and southern Great Xing'an Range, has been geochronologically investigated using zircon LA-ICP-MS U-Pb dating in this study. The results presented here show the peak ages of 282 Ma, 317 Ma and 134 Ma, 242 Ma, 284 Ma for the Linxi Formation and the Baiyingaolao Formation, respectively. These data illustrates that the Baiyingaolao Formation should belong to the Cretaceous rather than the Jurassic as previously regarded. Moreover, according to the fabric of zircons analyzed, the provenance of the Linxi Formation might derived from the volcanic rock sedimentation by magmatic arc during Late Devonian to Early Carboniferous and Early Permian Dashizhai Formation volcanic rock sedimentation. This research also reveals that the absences of the Triassic strata in eastern Great Xing'an Range is ascribed to the ablation of structural uplift afterwards.