The　flow　scour　around　bridge　piers　is　the　result　of　the　interaction　among　the　flow,　sediment　and　the　pier.　The　complex　relationship　between　water　and　sediment　movement　around　bridge　piers　is　an　important　cause　of　bridge　water　damage.　Quantitative　analysis　of　scour　topographic　characteristics　of　bridge　piers　and　its　interaction　with　the　flow　is　an　important　breakthrough　in　deeply　understanding　the　mechanism　of　the　flow　and　sediment　interaction　around　bridge　piers　and　its　practical　engineering　application.　In　this　paper,　the　flow　scour　experiment　around　bridge　piers　of　uniform　sediment　moving　bed　was　carried　out　with　different　inclination　angles　under　two　kinds　of　slope　conditions,　and　four　model　inclination　angles　of　0°,　5°,　10°　and　15°　were　set　along　the　downstream　direction.　The　PIV　(particle　image　velocimetry)　system　was　employed　to　measure　the　two-dimensional　flow　field　around　bridge　piers,　and　the　SFM　(structure　from　motion)　method　was　used　to　achieve　the　three-dimensional　reconstruction　of　scour　topography.　Based　on　this,　the　characteristics　of　three-dimensional　topography　structure　of　bed　surface　scour　and　flow　field　were　analyzed,　which　are　used　to　build　up　the　coupling　relationship　between　the　two.　The　results　show　that:　1)　The　SFM　method　can　be　applied　to　reconstruct　the　three-dimensional　structure　of　scour　topography.　As　the　scour　experiment　reaches　its　equilibrium　stage,　the　scour　depth　in　front　and　on　both　sides　of　the　model　is　deeper,　and　the　rear　is　of　convex　shape,　rising　to　the　bed　surface　along　the　flow　direction.　2)　The　size,　area　and　volume　of　the　scour　hole　increase　with　the　increase　of　the　flow　intensity,　and　decrease　with　the　increase　of　the　inclination　angle.　As　the　depth　of　scour　hole　increases,　the　cross-sectional　area　and　three-dimensional　morphology　increase　in　parabola　with　opening　upward.　3)　As　the　inclination　angle　of　the　bridge　pier　model　increases,　the　disturbance　region　of　the　rear　streamwise　velocity　decreases　and　the　influence　region　on　the　spanwise　velocity　increases.　4)　As　the　model　inclination　angle　increases,　influence　regions　of　swirling-strength　and　shear　stress　decrease.　The　deep　scour　hole　around　bridge　piers　can　be　easily　formed　by　the　flow　shear　stress,　and　the　large-scale　streamwise　vorticity　on　both　sides　of　the　bridge　pier　extends　downstream,　which　leads　to　the　formation　of　shallow　long　grooves　on　the　back　two　sides　of　the　bridge　pier.　©　2021,　Editorial　Department　of　Advanced　Engineering　Sciences.　All　right　reserved.