In　this　paper,　we　design　and　prepare　five　kinds　of　high-boron　high-speed　steel　roll　materials.　The　microstructure,　mechanical　property　and　wear　resistance　of　highboron　high-speed　steel　roll　materials　were　studied　by　means　of　optical　microscopy　(OM),　scanning　electron　microscopy　(SEM),　X-ray　diffraction　(XRD)　and　hardness　measurement,　impact　test　and　abrasion　test.　The　results　show　that　as-cast　microstructure　of　high-boron　high-speed　steel　consists　of　martensite,　retained　austenite　and　borocarbide.　Hardness　of　as-cast　high-boron　high-speed　steel　excels　64　HRC.　In　unmodified　high-boron　high-speed　steel,　eutectic　borocarbide　is　distributed　in　a　network　along　the　grain　boundary.　With　the　addition　of　RE-Mg-Ti　compound　modifier,　the　networks　of　borocarbide　is　broken.　The　hardness　of　high-boron　high-speed　steel　gradually　decreased　with　the　increase　of　tempering　temperature.　Under　the　same　conditions,　the　impact　toughness　of　unmodified　high-boron　high-speed　steel　roll　material　is　slightly　lower　than　that　of　modified　steel.　The　wear　resistance　of　modified　high-boron　high-speed　steel　roll　material　is　greater　than　that　of　high-carbon　high-vanadium　high-speed　steel　roll.