In　the　bolt　tightening　control,　when　the　input　torque　is　given,　the　complicated　friction　phenomenon　at　the　bolted　joint　interface　will　lead　to　the　non-uniqueness　of　the　pre-tightening　force.　Moreover,　due　to　the　coupling　effect　of　uncertain　physical　factors　such　as　the　geometric　tolerance,　assembly　error,　bolt　tightening　sequence,　etc.,　an　inclination　angle　of　the　bolted　joint　interface　will　appear,　so　the　pre-tightening　force　becomes　more　complex.　To　this　problem,　firstly,　a　friction　model　with　an　inclination　angle　is　established　from　a　micro-macro　perspective.　Then　the　finite　element　method　is　used　to　analyze　the　bolt　tightening　behavior　with　different　inclination　angles.　Finally,　the　correctness　of　this　model　is　verified　by　the　tightening　experiment.　The　results　show　that　surface　topography　parameters　D　and　G　and　an　inclination　angle　beta　have　significant　effects　on　the　friction　coefficient,　because　surface　topography　affects　the　real　contact　area　and　contact　load　distribution,　resulting　in　the　change　of　friction　coefficient,　thus　affecting　the　bolt　pre-tightening　force.