The　carbon　emission　of　sewage　treatment　accounts　for　about　1%~2%　of　the　carbon　emission　of　the　whole　society.　In　order　to　achieve　the　carbon　peak　and　carbon　neutralization　goals　of　sewage　treatment　and　the　needs　of　building　future　sewage　treatment　plants,　the　development　of　carbon　emission　reduction　technologies　and　the　construction　of　carbon　neutralization　roadmap　in　sewage　treatment　industry　is　becoming　imminent.　Therefore,　this　special　column　is　a　summary　of　the　scientific　research　outputs　of　the　National　Major　Science　and　Technology　Projects　for　Water　Pollution　Control　and　Management　of　China　＂Key　technology　R　&　D　and　engineering　demonstration　of　sewage　treatment　plant　for　the　future＂　in　2017-2021.　Aiming　at　the　establishment　of　future　oriented　sewage　treatment　system,　from　the　perspective　of　＂carbon　emission　reduction＂　and　＂carbon　neutralization＂　of　sewage　treatment　plant,　the　research　on　three　key　technologies　of　sewage　＂carbon　redirection＂,　sewage　treatment　process　＂carbon　emission　reduction＂,　smart　water　based　on　big　data　and　cloud　platform,　and　future　oriented　engineering　practice　of　sewage　treatment　plant　are　summarized　and　condensed,　Provide　technical　support　for　＂carbon　emission　reduction＂　and　＂carbon　neutralization＂　of　China＇s　wastewater　treatment　plant.　©　2022,　Science　Press.　All　right　reserved.