Based　on　the　prototype　of　a　fly-bird　type　concrete-filled　steel　tube　(CFST)　truss　arch　bridge,　the　analysis　on　the　effect　of　different　debonding　length　and　debonding　locations　on　the　mechanical　performance　of　CFST　arch　bridge　is　carried　out.　The　results　show　that　the　axial　force　of　chord　steel　tube　increases　and　the　axial　force　of　core　concrete　decreases　due　to　debonding,　regardless　of　the　debonding　length　or　the　debonding　locations,　but　debonding　hardly　affect　the　total　axial　force　of　each　chord.　The　bending　moments　of　the　steel　tube,　the　core　concrete　and　the　total　bending　moments　of　each　chord　at　the　debonded　locations　are　not　uniform.　The　longer　of　deboning　length　is,　the　greater　of　the　maximum　deflection　is,　and　the　smaller　of　the　ultimate　bearing　capacity　is.　The　stiffness　and　ultimate　bearing　capacity　of　truss　arch　ribs　largely　decrease　when　whole　debonding　is　occurred,　and　the　maximum　deflection　increase　by　88%　and　the　ultimate　bearing　capacity　decrease　by　24%　compared　with　the　completely　bonding　situation.　©　Springer　Nature　Switzerland　AG　2020.