The　wall　pressure　generated　by　near-field　underwater　explosion　bubble　involves　significant　nonlinear　problems.　This　has　been　the　focus　and　difficulty　of　the　research　on　the　anti-explosion　design　of　battleships.　To　quantify　the　load　characteristics　of　bubble　pulsation　and　water　jet　pressure,　underwater　explosion　tests　were　conducted　beneath　a　clamped　square　plate　subjected　to　2.5g　TNT　at　different　distances　(R　=　10,　15,　20,　22.5,　and　25　cm).　Results　showed　that　as　the　stand-off　distance　increased　to　the　maximum　radius　of　the　bubble,　there　was　a　peak　value　of　the　impulse　for　bubble　pulsation　and　water　jet.　A　finite　element　model　was　then　established　and　benchmarked.　The　benchmarked　model　was　used　to　further　explore　the　load　characteristics　of　the　bubble　pul-sation　and　water　jet,　considering　the　effect　of　the　stand-off　distance,　plate　dimension,　horizontal　distribution,　and　explosive　equivalent.　It　was　found　that:　a)　as　the　plate　dimension　increased,　the　pressure　of　the　shock　wave　to　the　plate　was　basically　unchanged,　while　the　period　and　impulse　of　the　bubble　pulsation　and　water　jet　decreased;　b)　the　impact　of　the　water　jet　pressure　was　concentrated　within　6.72　times　the　radius　of　the　explosive.　Finally,　an　empirical　formula　was　proposed　to　predict　the　impulse　of　the　bubble　pulsation　and　water　jet.　This　research　is　able　to　provide　guidance　to　investigate　the　blast　resistance　of　ships.