High-carbon　high-speed　steels　(HSS)　are　extremely　abrasion　resistant　materials　due　to　their　high　hardness　MC　type　carbide　and　high　hardness　martensitic　matrix.　Different　microstructures　and　mechanical　behaviours　were　obtained　after　the　quenching　and　tempering　temperatures　of　HSS　roll　were　changed.　With　air　cooling　and　sodium　silicate　quenching,　when　the　austenitizing　temperature　reaches　1273K,　the　metal　matrix　all　transforms　into　the　martensite,　Afterwards,　the　eutectic　carbides　dissolve　ceaselessly　into　the　metal　matrix　and　its　continuous　network　distribution　changes　into　broken　network.　The　peak　hardness　temperature　of　high-carbon　HSS　is　around　1323K.　and　the　second　hardening　temperature　is　around　793K.　No　significant　change　in　tensile　strength　and　elongation　percentage　was　observed　unless　the　tempering　temperature　is　beyond　753K.　The　tensile　strength　is　increased　obviously　and　the　elongation　percentage　is　decreased　slightly　beyond　753K.　However,　the　tensile　strength　is　decreased　and　the　elongation　percentage　is　increased　when　the　temp　exceeds　813K.　The　high-carbon　HSS　roll　presents　excellent　abrasion　resistance　at　793K-813K.