A　new　type　of　retaining　wall,　the　sheet　pile　wall　with　a　relieving　platform,　is　introduced　in　this　paper.　Based　on　the　prototype　retaining　wall　with　a　height　of　12　meters,　the　model　tests　with　a　geometric　similarity　ratio　of　7　are　designed　and　we　focus　on　the　model　production　and　analysis　on　the　test　results.　Some　comparative　analyses　between　the　measured　values　and　the　calculation　values　by　using　the　theoretical　calculation　method　and　finite　difference　method　are　carried　out,　including　Earth　pressure　behind　the　wall,　prepile　resistance　force,　the　bending　moment,　and　the　deformation　of　rib　pillars　in　the　retaining　wall.　The　results　show　that　Earth　pressure　behind　the　wall　has　a　linear　increase　with　the　depth　and　lies　between　Rankine　Earth　pressure　and　Earth　pressure　at　rest.　Moreover,　the　prepile　resistance　force　can　be　approximated　by　the　m　method,　and　the　bending　moment　can　be　also　used　for　approximate　calculation　by　the　m　method　and　is　larger　than　the　results　calculated　by　the　finite　difference　method.　It　is　also　observed　that　there　is　a　zero-displacement　point　on　the　pile　bottom,　and　the　Earth　pressure　above　the　point　behind　the　pile　develops　from　Earth　pressure　at　rest　to　the　active　Earth　pressure;　the　Earth　pressure　under　the　point　behind　the　pile　develops　from　Earth　pressure　at　rest　to　the　passive　Earth　pressure.　Therefore,　the　Earth　pressure　behind　the　bottom　wall　is　larger　than　the　calculated　value　by　the　Rankine　theory.　Finally,　the　displacement　of　the　rib　pillars　is　greater　than　the　calculated　results　using　the　finite　difference　method　and　exceeds　the　standard　requirements,　owing　to　the　failure　of　the　retaining　wall,　and　the　unloading　board　needs　to　be　constructed　to　improve　the　retaining　wall＇s　behaviour.　These　findings　verify　the　model＇s　credibility　and　provide　an　underpinning　for　studying　the　behavior　of　the　retaining　wall.