Dam-break　accidents　occur　at　times　at　hydropower　stations;　dam-break　waves　often　impose　a　significant　impact　on　the　downstream　structures.　In　this　work,　physical　model　tests　are　carried　out　on　a　flume　to　record　the　mechanical　characterization　of　a　slope-deck　structure,　located　at　the　end　of　the　flume　that　is　impacted　by　the　dam-break　waves　created　by　a　dam-break　wave　generating　system　(DWGS).　We　focus　on　analysis　of　the　load　history　and　distribution　characteristics　of　uplift　pressure　on　the　structure　during　wave　impacting.　In　time　variation,　the　impact　pressure　shows　five　successive　stages;　the　two　stages　of　wave　front　impact　pressure　and　quasi-constant　pressure　are　examined　in　this　paper.　In　spatial　distribution,　these　two　pressures　decrease　along　the　stream　from　the　head　to　tail　of　the　deck　section,　while　they　change　little　in　the　cross-flow　direction.　Based　on　the　test　data,　a　formula　for　calculating　the　platform　uplift　pressure　distribution　is　fitted,　and　streamwise　variations　in　the　peak　values　of　wavefront　impact　pressure　and　quasi-constant　pressure　are　obtained.　©　2023　Tsinghua　University　Press.　All　rights　reserved.