The　transformation　kinetics,　microstructure,　hardness,　impact　toughness　and　sliding　wear　properties　of　high-Si　high-Mn　bainitic　steel　containing　0.45C-2.50Si-2.20Mn(wt%)　after　austenitizing　at　850,　880,　910,　940,　970　and　1000　degrees　C　were　systematically　studied　by　means　of　optical　microscopy,　scanning　electron　microscopy,　electron　backscatter　diffraction,　transmission　electron　microscopy,　laser　confocal　microscopy,　x-ray　diffraction,　microhardness　tester,　Rockwell　hardness　tester　and　M-200　wear　tester　(Jinan　Sida　Testing　Technology　Co.,　LTD,　China).　The　results　show　that　the　microstructure　of　the　sample　is　mainly　composed　of　acicular　lower　bainite,　film-like　retained　austenite　and　martensite/austenite　(M/A)　after　air　quenching.　As　the　austenitizing　temperature　increases,　the　microstructures　refine　first　and　then　change　little,　the　hardness　increases　first　and　then　remains　basically　unchanged,　the　impact　toughness　decreases　first　and　then　increases,　and　the　wear　resistance　first　increases　and　then　weakens,　and　increases　again　at　1000　degrees　C.　Under　the　same　test　conditions,　the　sample　austenitizing　at　910　degrees　C　shows　higher　hardness　and　toughness　coordination　before　and　after　tempering　at　250　degrees　C,　and　the　wear　resistance　is　the　best.