The deep buried large tunnel, which is complicated in the geologic condition. The unplanned construction often causes accidents, such as water flush, mud inrush, collapse, etc. Geological prediction is important to prevent disasters. Taking the Daxiangling tunnel as the example, the paper predicts the complex geology in the tunnel by the TGP206 and analyzes the geology at the macro and micro levels. The results show that this way can improve the prediction effect for unfavorable geology and the precision can reach to 95by comparing to the real condition. Then, the way provides a new idea for the safety of the tunnel construction, and technical information and the experience to the similar projects.