Effects　of　quenching　temperature　on　microstructure　and　mechanical　properties　of　Fe-Cr-B-Al　alloy　containing　8%Cr,　1.5%B　and　1.5%Al　were　investigated　in　the　condition　of　oil-cooling　quenching.　The　results　show　that　the　microstructure　of　as-cast　Fe-Cr-B-Al　alloy　is　consist　of　M2(B,　C)　(M=Fe,　Cr,　Mn),　(Cr,　Fe)7(C,　B)3,　martensite　and　pearlite.　After　quenching,　the　network　eutectic　borocarbides　are　broken　and　spheroidized,　which　lead　to　the　increase　of　tensile　strength　and　impact　toughness　of　Fe-Cr-B-Al　alloy.　When　quenching　temperature　exceedes　950°C,　the　matrix　is　transformed　into　martensite　from　the　mixture　of　martensite　and　pearlite,　and　hardness　of　Fe-Cr-B-Al　alloy　increases.　When　quenching　temperature　is　over　1050°C,　borocarbides　begin　to　coarsen.　Fe-Cr-B-Al　alloy　quenched　at　1050°C　has　good　comprehensive　properties.