Wear　resistant　performance　of　two　kinds　of　high　speed　steel　(HSS)　roll　materials　differently　tempered　was　studied　by　two-body　abrasive　wear　test　on　a　pin-on-disk　tester.　The　results　show　that　HSS　has　no　secondary　hardening　when　quenching　temperature　is　lower,　but　the　content　of　retained　austenite　has　obviously　increased　when　quenching　temperature　is　higher,　and　it　transforms　to　martensite　when　tempering　cooling,　which　leads　to　hardening　of　HSS.　Common　HSS　has　excellent　wear　resistance　while　quenching　at　1050°C　and　tempering　at　530-560°C,　and　the　HSS　treated　by　titanium　and　magnesium-rare　earth　has　excellent　wear　resistance　while　quenching　at　1040°C　and　tempering　at　520-540°C.　Under　the　same　wear　condition,　the　weight　loss　of　HSS　treated　by　titanium　and　magnesium-rare　earth　is　lower　than　that　of　common　HSS.