A　prediction　model　of　bristle　pack　deformation　in　consideration　of　the　leakage　flow　aerodynamic　force,　the　frictional　force　between　bristles,　and　the　interaction　between　bristle　pack　and　front　or　backing　plate　was　presented.　The　three-dimensional　Reynolds-averaged　Navier-Stokes　(RANS)　equations　based　on　non-linear　Darcian　porous　medium　model　and　combined　with　finite　element　analysis　contact　model　were　applied　to　analyze　the　effects　of　three　different　backing　plate　structures　on　the　leakage　flow,　tip　force　and　heat　transfer　characteristics　of　the　brush　seal.　The　numerical　results　of　leakage　flow　rate　of　brush　seal　with　typical　backing　plate　structure　agree　well　with　the　experimental　data,　which　verifies　the　reliability　of　this　numerical　method.　The　results　show　that　the　influences　of　the　backing　plate　with　annular　groove　on　the　leakage　flow　and　pressure　distribution　of　brush　seal　are　small　compared　with　typical　backing　plate　structure.　The　axial　aerodynamic　force　acting　on　the　bristle　pack　increases　linearly　with　the　pressure　ratio.　The　annular　groove　structure　can　increase　the　static　pressure　on　the　downstream　bristles,　decrease　the　axial　deformation　of　the　bristle　pack　and　reduce　the　stiffness　effect.　In　addition,　the　annular　groove　structure　can　weaken　the　disturbance　caused　by　irregular　leakage　flow　on　the　bristles.　The　high　temperature　region　is　located　around　the　bristle-rotor　contact　area.　The　annular　groove　can　effectively　improve　the　temperature　distributions　of　the　bristle　pack　and　rotor.　©　2019,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.