Tsunami　bores　have　a　strong　destructive　ability,　capable　of　damaging　coastal　structures　and　endangering　human　life.　This　study　focuses　on　the　interactions　between　tsunami　bores　and　3D　jetty　models　through　physical　experiments.　The　characteristics　of　tsunami　bores　travelling　at　different　initial　water　depths　(IWL)　were　examined.　The　distributions　of　slamming　pressure　and　quasi-steady　pressure　on　the　jetty　deck　in　different　directions　were　assessed.　The　results　showed　that　the　initial　water　depths,　deck　heights　(hd)　and　slope　angles　(θ)　had　significant　influences　on　the　slamming　pressure.　New　equations　were　proposed　to　calculate　the　tsunami　slamming　pressures　and　quasi-steady　pressures　on　the　jetty　decks.　The　energy　loss　coefficients　k1　(ranging　from　0.40　to　0.80)　and　k5　(ranging　from　0.65　to　0.90)　are　related　to　the　initial　water　depth,　which　was　found　to　be　essential　for　the　calculation　accuracy　of　tsunami　pressures　on　the　jetty,　and　the　errors　were　within　±20%.　©　2023　Elsevier　Ltd