In　order　to　select　cutting　modes　suitable　for　switch　blades　of　different-number　turnouts　and　so　to　improve　train-running　performance　and　rail　wearing,　the　vehicle-switch　dynamic　coupling　models　was　established　on　the　basis　of　the　wheel-rail　system　dynamics.　Turnouts　No.18　and　No.42　were　taken　as　examples　to　analyze　wheel-rail　dynamic　responses　and　rail　wear　performance　corresponding　to　five　different　cutting　modes　of　switch　blade,　and　the　relevant　factors　affecting　the　wear　index　were　calculated.　Results　show　as　follows:　Dynamic　evaluation　can　provide　reasonable　guidance　for　selection　of　the　cutting　mode　of　switch　blade;　for　Turnout　No.18　of　the　small　number,　semi-tangent　and　tangent　switch　blades　should　be　selected　to　realize　good　turnout　performance　and　low　rail　wear,　the　separated-semi-tangent　switch　blade　is　robust　and　can　also　be　one　of　the　main　line　types;　for　Turnout　No.42　of　the　large　number,　semi-tangent　switch　blades　have　strong　applicability;　geometry　irregularity　and　some　other　factors　should　be　taken　into　calculation　of　the　dynamic　responses　of　turnout　switches　in　operation.　©,　2014,　Science　Press.　All　right　reserved.