This　paper　studied　two　types　of　refiner　disc　materials　abrasion　with　soft　particles　in　the　pin-disc　equipment.　The　results　showed　that　soft　particles　abrasion　is　different　from　hard　particles.　Firstly　soft　phase　produces　plastic　deformation　between　the　soft　phase　and　the　hard　one.　Then　the　dislocation　is　generated　and　accumulated　and　finally　developed　into　cavitations　before　they　become　the　crack,　which　results　in　material　peeling　off　lastly.　The　wearing　resistance　of　austenite　is　better　than　martensite　because　it　has　good　plastic　deformation.