Due　to　the　particle　self-wear　and　friction　between　particles　and　the　working　wall　of　magnetorheological　(MR)　brake,　the　braking　effect　of　MR　brake　will　be　affected.　Therefore,　it　is　very　important　to　analyze　the　tribological　performance　of　MR　fluid.　In　this　study,　four　kinds　of　MR　fluid　(MRF)　were　prepared　with　graphite　and　grease　of　silicone　fluid　as　extra　additives.　First,　the　working　condition　of　MRF　in　elevator　transmission　device　was　simulated　by　four-ball　test　machine.　The　friction　coefficient　changing　of　MRF　was　recorded,　and　the　size　of　wear　scar　was　observed　and　measured　by　image　microscope.　Then,　by　measuring　the　changes　of　the　rheological　properties　of　MRF　before　and　after　the　friction　experiment　with　rheometer,　the　influence　of　friction　and　wear　on　performance　of　the　MRF　in　the　device　was　analyzed.　The　experimental　results　show　that　the　additive　can　reduce　the　friction　of　MRF　to　a　certain　extent,　and　the　rheological　properties　increase　after　friction.　The　prepared　MRF　number　3　has　low　zero-field　viscosity,　high　yield　shear　stress,　and　good　stability,　suitable　for　the　MRF　of　traction　elevator　brake.　©　2022,　Editorial　Board　of　Journal　of　Chongqing　University,　Chongqing　University　Journals　Department.　All　right　reserved.