Abstract: Considering that fault zones are key areas in tunnel construction due to poor stability of rock masses, and based on ANSYS/LS-DYNA software, a 3D numerical simulation under the blasting load is performed for a tunnel passing through faults；the influences of faults at different locations on the dynamic responses of the surrounding rock are analyzed; the distribution characteristics of the peak values of the rock’s vertical displacements, vertical vibration velocities and maximum principal stresses are summarized; the most unfavorable locations and working conditions, as well as the safe distance between the sidewall and fault, are presented for such a tunnel.