According to the basic theory of concrete damage,the concrete piecewise curve damage model is applied into the finite analysis of shotcrete lining.The secondary development of Ansys is done with Ansys Parametric Design Language.The shotcrete lining's damage degree due to the vibration of the excavation blasting is simulated in underground engineering.The maximum damage value and the damage accumulation development trend in different conditions are considered in the case calculation.With the allowed damage criterion of 5%,the maximum explosion weights in different conditions are calculated.