In　this　research,　a　new　type　of　slurry　blast　machine　has　been　developed,　which　uses　slurry　mixtures　of　water　and　abrasives　to　impact　moving　steel　belts　to　achieve　mechanical　descaling.　A　test　rig　of　water　pressure　descaling　system　was　established,　and　the　descaling　efficiency　of　slurry　spray　was　tested.　Then,　the　influence　of　motor　speed,　pressure,　flow　rate,　and　target　distance　on　descaling　efficiency　was　studied,　and　complete　scale　removal　was　realized.　The　experiment　results　exhibited:　(1)　the　output　impact　force　of　the　slurry　blast　machine　is　proportional　to　the　motor　speed　and　flow　rate,　and　inversely　proportional　to　the　target　distance.　(2)　The　system　pressure　mainly　affects　the　vacuum　degree　in　the　mixing　chamber,　and　has　little　effect　on　the　impact　force.　(3)　Abrasive　jet　has　a　greater　impact　force　than　non-abrasive　jet　because　the　abrasive　density　increases　the　average　density　of　mixed　slurry　jet.　This　research　is　expected　to　provide　a　guidance　for　the　structural　optimization　of　slurry　blast　machine,　and　it　will　also　provide　a　new　method　used　for　strip　descaling.　©　2019　IEEE.