In　this　paper,　the　cavitaion　resistance　of　the　two　refiner　plate　materials　was　tested　and　compared　with　magnetostriction　equipment.　The　effect　of　carbide　and　matrix　on　material　cavitation　resistance　was　discussed.　In　addition,　the　cavitation　development　process　was　analyzed　by　SEM.　The　results　showed　that　net　carbide　reduces　materials　cavitation　resistance　because　it　dissevers　matrix　and　causes　itself　to　delaminate　more　easily.　Martensitic　matrix　has　better　cavitation　resistance　than　austenitic　because　of　its　good　strength.　Cavition　failure　begins　firstly　from　grain　boundary,　and　then　results　in　carbide　or　matrix　crack　and　drop.