Abstract: Timely identification of tunnel damage and rehabilitation will ensure safe tunnel operation since tunnel is an important part of traffic engineering. Based on a two-dimensional tunnel model, taking the pressure generated by high-speed train passing through tunnel as the applied load, the time-history curve of inner lining node is obtained by FEM, the curvature curve corresponding to this time-history curve is factorized by using wavelet packet transform, and the position of damage is identified by taking the standard error of displacement curvature energy as a damage index. The research results show that this method can effectively identify the position of tunnel damage.