Artificial　sweeteners　(ASs)　are　of　growing　concern　as　an　emerging　contaminant.　In　the　study,　the　seasonal　occurrence,　removal　and　mass　load　of　six　ASs　in　sewage,　suspended　particulate　matter　(SPM)　and　sludge　were　investigated　throughout　the　treatment　process　of　the　largest　water　reclamation　plant　in　China.　The　highest　ASs　concentrations　in　the　influent　(13.0　mu　g/L),　effluent　(2.22　mu　g/L),　SPM　(4.48　mu　g/g)　and　sludge　(0.15　mu　g/g)　were　observed　in　the　dry　season,　which　were　1.24-　to　5.0-fold　higher　than　in　the　normal　season　and　1.06-　to　37.5-fold　higher　than　the　flood　season.　Following　treatment,　ASs　concentrations　decreased　by　24.3　%,　51.7　%　and　5.1　%　(on　average)　in　primary,　secondary　and　reclaimed　processes,　respectively.　Among　the　investigated　ASs,　acesulfame　(93.1　%)　and　cyclamate　(98.4　%)　were　removed　most　efficiently,　with　removal　occurring　mainly　in　secondary　processes,　while　sucralose　exhibited　the　lowest　removal　efficiency　(38.7　%).　Seasonal　characteristics　affect　the　consumption　of　ASs,　which　subsequently　changes　the　input　and　discharge　ASs　loads　of　STPs.　The　maximum　mass　load　of　ASs　occurred　in　the　dry　season,　ranging　from　0.002　(neotame)　to　1.33　mg/d/person　(cyclamate),　while　the　maximum　emission　load　occurred　in　the　flood　season,　ranging　from　0.003　(neotame)　to　0.83　mg/d/person　(sucralose).　The　mass　and　emission　load　of　ASs　in　Beijing　is　significantly　lower　than　in　European　or　the　United　States,　due　to　Beijing　having　low　per　capita　consumption　of　ASs　(5.50　mg/d/person).　The　highest　ASs　risk　in　the　receiving　water　occurred　in　the　flood　season　due　to　the　input　of　other　pollution　sources　by　rainfall　runoff.　Meanwhile,　attention　should　be　paid　to　the　risk　of　receiving　water　close　to　the　STP　outlet　in　the　dry　seasons　for　the　highest　ASs　concentration　in　the　STP　effluent　in　the　season.　The　present　study　provides　important　guidance　on　controlling　the　input　and　reducing　the　emission　of　ASs　in　different　seasons.