Using　self-made　electromagnetic　centrifugal　casting　machine,　optical　microscopy　(OM)　and　D/max2200pc　X-ray　diffraction,　the　solidification　microstructure　and　phases　of　as-cast　high　speed　steel(HSS)　roll　made　by　sand　casting,　centrifugal　casting　and　electromagnetic　centrifugal　casting　were　investigated.　The　experiment　results　show　that　the　phases　of　as-cast　high　speed　steel　(HSS)　roll　are　alloy　carbide　(such　as　W2C,　VC,　Cr7C3),　martensite　and　austenite.　The　centrifugal　casting　and　electromagnetic　centrifugal　casting　can　apparently　improve　the　solidification　structure　of　HSS　roll.　With　the　increase　of　electromagnetic　field　intensity　(B),　the　volume　fraction　of　austenite　in　the　HSS　solidification　structure　increased　obviously　and　eutectic　ledeburite　decreased,　the　secondary　carbide　precipitated　from　the　austenite　is　more　fine　and　distribution　of　secondary　carbide　is　more　even.