Abstract:The numerical simulation of medium long-hole millisecond blasting in infinite rock mass with single free face was carried out by using FEM program of ANSYS /LS-DYNA and ALE algorithm.The analysis result indicated that simulation can be used to demonstrate the time-history of effective stress in blasting,the propagation of blasting stress wave and the dynamic process of rock blasting fragmentation,simulated results can provide reference for blasting design.