A　study　on　solidification　process　of　centrifugal　cast　high-speed　steel　(HSS)　rolls　and　the　crack　forming　condition　is　discussed.　The　result　was　represented　that　the　crack　forming　was　because　of　the　solidification　layer　strength　of　HSS　roll　was　low,　and　a　clearance　between　the　solidification　layer　and　the　mould,　and　the　solidification　layer　of　HSS　roll　could　not　endure　a　large　centrifugal　pressure.　In　common　centrifugal　casting,　the　free　solidification　constriction　of　HSS　rolls　was　difficult,　which　accelerated　the　crack　propagation.　The　appearance　of　mesosphere　and　axial　solidification　was　unfavorable　to　obtaining　the　compact　roll　structures,　which　accelerated　HSS　rolls　to　crack.