In order to investigate numerical method of interaction of bubble and box-beam,choose box-beam as simulation object,simulation model of box-beam induced by underwater near-distance explosion bubble is built by using MSC-DYTRAN software,effects of pressure gradient depennding on a water depth are considered and opened flow boundry are applied, and the multimaterial and multieular field is built by using adaptive mesh, the modified shock pressure field is induced to modify the shock phase, the typical test case is simulated,numerical results were compared with experimental data,it is shown that the reaction properties of ship and bubble and damage mode and strain curve coincide well with experiment data,the error between the caculated results and experiment results is in 25%,this method point a path to investigate the damage properties of box-beam induced by underwater near-distance explosion bubble by using mumerial method.