The　microstructure,　mechanical　properties　and　wear　resistance　of　high　chromium　cast　steel　containing　boron　after　different　heat　treatments　were　studied　by　means　of　the　optical　microscopy　(OM),　the　scanning　electron　microscopy　(SEM),　X-ray　diffraction　(XRD),　hardness,　impact　toughness,　tensile　and　pin-on-disc　abrasion　tests＇.　The　results　show　that　as-cast　microstructures　of　boron-free　high　chromium　steel　consist　of　martensite　and　a　few　(Cr,　Fe)(7)C-3　carbide,　and　the　macro-hardness　of　boron-free　high　chromium　steel　is　55-57　HRC.　After　0.5　mass%　B　was　added　into　high　chromium　cast　steel,　as-cast　structure　transforms　into　eutectic　(Fe,　Cr)(2)B,　(Cr,　Fe)(7)　(C,　B)(3)　and　martensite,　and　the　macro-hardness　reaches　58-60　HRC.　High　temperature　quenching　leads　to　the　disconnection　and　isolated　distribution　of　boride,　and　there　are　many　(Cr,　Fe)(23)　(C,　B)(6)　precipitated　phases　in　the　quenching　structure.　Quenching　from　1050　degrees　C,　high　chromium　steel　obtained　the　highest　hardness,　and　the　hardness　of　high　chromium　cast　steel　containing　boron　is　higher　than　that　of　boron-free　high　chromium　steel.　The　change　of　quenching　temperature　has　no　obvious　effect　on　impact　toughness　of　high　chromium　steel,　and　the　increase　of　quenching　temperature　leads　to　tensile　strength　having　an　increasing　tendency.　At　the　same　quenching　temperature,　the　wear　resistance　of　high　chromium　cast　steel　containing　boron　is　more　excellent　than　that　of　boron-free　high　chromium　steel.　High　chromium　cast　steel　guide　containing　boron　has　good　performance　while　using　in　steel　bar　mill.