Ecological　concrete　(eco-concrete)　can　reduce　excess　nutrients　(nitrogen　and　phosphorus)　in　water,　but　its　effectiveness　in　removing　nutrients　in　marine　coastal　sediments　and　the　response　of　sediment　microbial　communities　to　its　use　are　largely　unknown.　In　this　study,　eco-concrete　planted　with　Bruguiera　gymnorrhiza　was　used　to　remove　nutrients　in　marine　coastal　sediment.　We　found　that　the　mean　removal　efficiencies　of　sediment　total　nitrogen　and　total　phosphorus　by　using　planted　eco-concrete　were　11.50%　and　30.31%　on　day　60,　and　were　higher　than　those　obtained　by　only　using　B.　gymnorrhiza　(7.14%　and　7.36%).　the　Diatoms　and　bacterial　genera　Fusibacter　and　Anoxynatronum　(which　belong　to　Firmicutes)　increased　and　became　the　abundant　microbes　by　day　60　when　using　planted　eco-concrete,　indicating　their　potential　roles　in　nutrient　removal.　Moreover,　the　eco-concrete　did　not　endanger　the　core　microbes　in　sediment　suggesting　its　environment-friendly　character.　Our　results　suggest　a　potential　method　to　control　marine　coastal　eutrophication.　©　2020　Elsevier　Ltd