Blast　furnace　slag　has　good　adsorption　performance　and　can　be　used　to　adsorb　heavy　metal　ions　in　waste　liquid.　It　is　worth　to　study　whether　the　blast　furnace　slag　absorbing　heavy　metal　ions　will　pose　a　potential　threat　to　the　environment　during　the　process　using　the　cement-based　materials.　The　leaching　amount　of　copper　ions　and　the　leaching　kinetics　in　the　blast　furnace　slag-cement　system　were　analyzed.　The　results　showed　that　the　leaching　amount　of　copper　ions　in　the　blast　furnace　slag-cement　system　basically　met　the　national　standard,　and　the　solidified　period　was　28　days.　The　blast　furnace　slag　content　30%　is　the　smallest　condition　for　the　amount　of　copper　ion　leaching.　The　leaching　model　of　copper　ions　in　the　blast　furnace　slag-cement　system　is　the　Elovich　equation,　which　is　a　heterogeneous　diffusion　process.　The　longer　the　curing　period　is　the　slower　the　leaching　process　is　completed　and　it　does　not　cause　environmental　pollution　during　long-term　use.　©　2021　Trans　Tech　Publications　Ltd,　Switzerland.