In　this　paper,　the　fretting　wear　properties　of　20CrMnTi　steel,　a　common　material　for　a　rocker　bracket,　was　discussed　for　the　first　time　after　it　was　suffered　carburizing　treatment.　Subsequently,　the　fretting　wear　behaviors　of　virgin,　quenched,　and　carburized　states　were　studied.　The　effect　of　loads　(corresponding　to　different　engine　power　output)　and　reciprocating　frequencies　(corresponding　to　different　engine　speed)　on　wear　behaviors　and　mechanisms　of　carburized　specimen　were　further　discussed.　The　results　showed　that　the　coefficient　of　friction　(CoF)　and　wear　volume　loss　(WVL)　of　the　carburized　specimens　were　significantly　lower　than　that　of　virgin　and　quenched　states.　During　the　wear　test,　the　surface　CoF　decreased　gradually　with　the　increase　of　applied　load,　while　the　linear　correlation　trend　was　not　observed　with　the　increase　of　fretting　frequency　as　it　showed　an　increase　first　and　then　a　decrease.　It　was　observed　that　the　WVL　increased　gradually　with　the　increase　of　load　and　frequency.　With　an　increase　of　the　load,　the　wear　mechanism　gradually　deteriorated　from　the　initial　adhesive　wear　to　the　mixed　wear　mechanism.　When　the　load　was　high,　the　oxidative　wear　became　more　severe.　However,　no　significant　effect　of　frequency　was　observed　on　the　wear　mechanism.