The　bulging　process　of　reinforced　concrete　surface　under　internal　blast　loading　was　studied.　A　high-speed　motion　analysis　system　was　used　to　record　the　dynamic　bulging　process　of　reinforced　concrete　surface　to　obtain　its　bulge　contour,　central　displacement　and　bulging　velocity　curves.　A　separable　reinforced　concrete　numerical　model　and　fluid-solid　interconnection　method　were　used　to　predict　the　development　of　surface　bulge　in　LS-DYNA.　The　experimental　results　show　that　the　velocity　of　surface　bulge　is　controlled　mainly　by　the　pressure　of　explosive　gas,　and　the　stress　wave　cracks　the　concrete　initially.　The　blasting　crater　profile　is　similar　to　a　ladder.　Numerical　simulation　results　show　that　the　numerical　model　can　be　used　to　predict　the　bulging　process　of　surface,　and　the　numerical　results　coincide　well　with　the　experimental　data.