An　experimental　study　was　carried　out　to　investigate　the　tsunami　surge　impacts　on　small　balls　climbing　on　different　slopes.　Dam-break　flows　were　generated　in　a　flume　to　simulate　tsunami　surge.　The　water　surface　profiles　at　the　sluice　gate　were　observed,　the　tsunami　inundation　height　and　the　surge　velocity　in　the　flume　were　measured,　and　the　maximum　climbing　heights　of　small　balls　on　different　slopes　were　recorded.　Results　show　that　the　dam-break　speed　and　the　tsunami　surge　strength　increase　with　increasing　reservoir　water　level.　The　increasing　tsunami　inundation　height,　the　decreasing　ball　density,　and　the　decreasing　ball　diameter　have　positive　effects　on　the　maximum　ball　climbing　height.　Based　on　the　normalized　experimental　data,　equations　for　estimating　the　maximum　ball　climbing　heights　on　different　slopes　were　proposed　as　functions　of　the　inundation　height,　the　ball　diameter,　and　the　ball　density.　The　calculated　values　from　the　equation　are　generally　within　±20%　of　the　measured　values　in　the　experimental　ranges.　©　2020　World　Scientific　Publishing　Company.