Abstract: The metal structure damage under explosion of detonator is simulated by LS-DYNA. The material model applied is analyzed in detail. The difference between Euler and Lagrange algorithm is described. The influences of different meshing density on the precision of results are compared. In the plain strain problems, both two-dimensional and three-dimensional models are applicable, and their calculation results are compared. The comparison with the experimental results shows that the LS-DYNA can simulate the impact reaction of metal structure under explosion load effectively.