In　this　paper,　the　effects　of　different　quenching　holding　times　on　the　microstructure　and　properties　of　high-silicon　hypereutectic　high-chromium　cast　iron　(Fe-4.0C-35.0Cr-1.9Si)　were　investigated.　The　effect　of　quenching　holding　time　on　the　microstructure　of　high　silicon　hypereutectic　high　chromium　cast　iron　was　analyzed　by　optical　microscope,　scanning　electron　microscope　and　X-ray　diffractometer.　The　hardness　and　wear　resistance　of　high-silicon　hypereutectic　high-chromium　cast　iron　quenched　at　1150　degrees　C　for　different　time　were　tested　by　Rockwell　hardness　tester,　microhardness　tester　and　wear　tester.　The　results　show　that　the　microstructure　of　as-cast　high-silicon　hypereutectic　high-chromium　cast　iron　is　mainly　composed　of　pearlite　matrix　and　M7C3　carbide.　Quenching　heat　treatment　makes　part　of　the　matrix　transform　from　pearlite　to　martensite,　and　precipitate　a　small　amount　of　M23C6　type　secondary　carbide.　With　the　increase　of　quenching　holding　time　from　1　h　to　6　h,　the　amount　of　martensite　transformation　gradually　increases,　the　primary　carbide　has　no　obvious　change,　the　eutectic　carbide　tip　dissolves,　and　the　morphology　gradually　becomes　smooth.　The　hardness　and　wear　resistance　both　increase　first　and　then　decrease.　After　4　hours　of　insulation,　the　hardness　reaches　the　highest　60.5HRC,　which　is　increased　by　3　HRC　compared　to　1　hour　of　insulation.　The　wear　resistance　increases　by　22.1%　compared　to　1　hour　of　insulation.　At　this　time,　the　wear　resistance　is　the　best.