It’s significant to obtain the mechanic laws and weak parts of soil tunnel, and the most likely failure elements under the explosion shock action to prevent terrorist attacks which can cause tremendous loss of human life and property and collapse and damage of many buildings and construction. Therefore, numerical simulation for soil tunnels is carried through the explicit dynamic finite element program ANSYS/LS-DYNA, and the time-history curves are discussed about the soil surrounding tunnel under explosion action. The dynamic response of soil tunnel under the explosion action is analyzed by establishing finite element integral model of soil tunnel dynamic analysis and comprehensively considering the solving method of nonlinear dynamic equation, the selection of different material models, the method of explosion shock wave input and the convergence and realizing factors of fluid-solid coupling effect. Thus, a reference for antiknock design of tunnels is presented.