This　paper　studies　the　best　tempering　process　and　provides　guidance　for　the　industrial　application　of　modified　Al-bearing　high　boron　high-speed　steel　(AB-HSS)　in　the　future.　The　microstructure,　hardness　and　wear　resistance　of　modified　AB-HSS　after　quenching　at　1150　degrees　C　and　tempering　in　the　different　condition　were　investigated.　The　results　showed　that　the　matrix　of　modified　AB-HSS　consisted　of　tempered　martensite　after　once　tempering　at　500　degrees　C　and　530　degrees　C　for　four　hours.　Small　granular　secondary　M-23(C,　B)(6)type　borocarbides　were　precipitated　from　the　matrix.　With　the　increase　of　tempering　temperature,　the　macro-hardness,　micro-hardness　and　wear　resistance　of　modified　AB-HSS　all　decreased　gradually.　With　the　increase　of　tempering　times　and　tempering　holding　time,　a　part　of　tempered　martensite　was　decomposed　into　ferrite,　and　the　macro-hardness　and　micro-hardness　all　decreased　slowly.　Appropriate　tempering　process　of　modified　AB-HSS　was　once　tempering　at　500　degrees　C-530　degrees　C　for　four　hours.