In　order　to　solve　the　problem　that　longitudinal　cracks　were　commonly　produced　in　the　present　normal　deck　surfacing　layer　of　steel　bridge　due　to　its　weak　lateral　stiffness,　this　paper　put　forward　a　kind　of　smooth　plate　shear　connector　that　can　improve　the　lateral　stiffness　of　deck　by　making　steel　bridge　deck　and　RPC　layer　work　together.　To　study　the　shear　force　transfer　mechanism　of　this　kind　of　shear　connector　in　composite　deck,　nonlinear　finite　element　models　(FEM)　of　composite　deck　of　push　out　tests　were　established.　The　failure　modes,　shear　bearing　capacity　and　load-slip　curves　of　numerical　models　were　verified　by　tests.　The　failure　modes　of　smooth　plate　shear　connector＇s　push-out　specimens　were　obtained　by　combining　finite　element　models　and　test　results.　The　verified　numerical　simulation　method,　the　influence　of　several　parameters,　such　as　thickness　and　strength　of　connector,　and　compressive　strength　of　RPC　with　steel　fabric　or　not,　on　shear　capacity　of　steel　and　RPC　composite　deck　with　smooth　plate　shear　connector　was　analyzed.　The　results　show　that　the　failure　modes　of　smooth　plate　shear　connector　can　be　classified　into　two　types　including　tensile　failure　of　connector　root　and　local　compression　failure　of　RPC　below　the　shear　connector.　When　compressive　strengths　of　RPC　are　80,　100,　120,　140　MPa,　the　reasonable　thicknesses　of　corresponding　smooth　plate　shear　connector　are　6,　8,　10,　12　mm　respectively.　The　shear　bearing　capacity　of　composite　bridge　deck　correspondingly　increases　with　the　increase　of　strength　of　smooth　plate　shear　connector　material　and　the　increase　range　of　thin　steel　plate　connector　is　more　significant　than　that　in　thick　one.　The　shear　bearing　capacity　of　composite　bridge　deck　also　correspondingly　increases　with　the　increase　of　strength　of　RPC,　while　the　increase　range　is　not　obvious　when　the　thickness　of　steel　plate　connector　is　relatively　small.　Contribution　of　increasing　steel　fabric　to　bearing　capacity　and　stiffness　of　composite　deck　is　little,　but　it　is　extremely　useful　for　improving　shearing　ductility　of　composite　bridge　deck.　©　2017,　Editorial　Department　of　Journal　of　Chang＇an　University　(Natural　Science　Edition).　All　right　reserved.