Calcium　carbonate　fouling　behaviors　of　jet　impingement　on　copper,　nickel-coating　copper　and　aluminium　surface　were　investigated　experimentally.　The　asymptotic　fouling　resistances　varied　with　time　were　obtained　under　conditions　of　different　hardness　and　surfaces.　The　results　show　that　with　the　increasing　of　carbonate　hardness,　the　fouling　rates　on　the　copper,　nickel-coating　copper　and　aluminium　surface　all　increase　but　the　induction　period　decreases.　The　asymptotic　fouling　resistance　differences　of　copper-to-nickel-coating　copper　or　copper-to-aluminium　also　increase　at　the　same　time.　The　longest　induction　period　and　the　smallest　asymptotic　fouling　resistance　are　found　for　aluminium　surface　among　all　three　different　surfaces　under　hardness　of　both　500　mg/L　and　700　mg/L,　however,　the　asymptotic　fouling　resistance　for　aluminium　surface　displays　the　biggest　value　under　the　hardness　of　300　mg/L.　©　2012　Chin.　Soc.　for　Elec.　Eng.