Abstract:Through survey on geological characteritics, such as topography, lithology, geological structures and rock and soil engineer, combining with engineering geophysical, geological drilling, rock mechanics test of physical and geological mapping and other survey results, stability of tunnel body and rocks in the entrance of the tunnul and surrounding rocks has been analyzed. Engineering geological problemsIt which will be met in tunnel construction process have been pointed out, and some countermeasures are put forward, such as geological predication, support, preventing geological disasters and protecting the ecological environment.