The　performance　of　a　18　L　step-feed　cyclic　activated　sludge　technology　(CAST)　combined　with　real-time　control　treating　real　municipal　wastewater　was　evaluated.　The　operation　strategies　employed　pH　and　oxidation　reduction　potential　(ORP)　as　on-line　control　parameters,　which　can　control　the　durations　of　oxic　and　anoxic　phases　flexibly.　The　obtained　results　showed　that　the　studied　process　had　achieved　advanced　and　enhanced　nitrogen　removal　by　several　phases　of　consecutive　oxic/anoxic　periods.　Total　nitrogen　in　effluent　was　lower　than　2　mg/L　and　the　average　TN　removal　efficiency　was　higher　than　98%,　while　only　requiring　small　amount　of　external　carbon　source.　Unexpected　characteristic　points　in　pH　and　ORP　profiles　denoting　the　depletion　of　nitrate　were　also　observed　during　the　last　anoxic　phase.　Denitrification　rate　was　found　to　be　more　dependent　on　the　system　temperature　compared　to　nitrification　rate.　Moreover,　a　stable　and　efficient　phosphorus　removal　rate　above　90%　was　achieved　by　using　step-feed　strategy　which　enabled　the　influent　carbon　source　to　be　fully　used　and　the　favourable　condition　for　phosphorus　releasing　to　be　created　during　the　anoxic　phases.