In order to study the formation and development process of cavity,pressure change,energy utilization of explosion with large radius charge in soil,the formation and development process of explosion cavity in soil with large radius coupling charge and decoupling charge were simulated with LS-DYNA software.The curve of displacement,velocity of fixed elementary particles,energy utilization and the development process of pressure and so on were analyzed by LSPREPOST.The blasting effect of coupling charge and decoupling charge was compared.The simulation results are found to be agreement with that of theoretical calculation.It indicates that the model and algorithm presented in this paper are reasonable.It needs to apply coupling charge to ruinous blasting and decoupling charge to trim blasting.The numerical method and conclusion can be used for engineering design.