To　develop　technically　feasible　and　economically　favorable　dynamic　process　control　(DPC)　strategies　for　an　alternating　activated　sludge　(AAS)　system,　a　bench-scale　continuous-flow　alternating　aerobic　and　anoxic　reactor,　performing　short-cut　nitrogen　removal　from　real　domestic　wastewater　was　operated　under　different　control　strategies　for　more　than　five　months.　A　fixed-time　control　(FTC)　study　showed　that　bending-points　on　pH　and　oxidation-reduction　potential　(ORP)　profiles　accurately　coincided　with　the　major　biological　activities.　＂Ammonia　valley＂　on　the　pH　profile　represented　the　end　of　nitrification,　whereas,　the　＂nitrite　knee＂　on　the　ORP　profile　and　＂nitrite　apex＂　on　the　pH　profile　both　indicated　the　end　of　denitrification.　Therefore,　a　new　reliable　and　effective　real-time　control　strategy　was　developed　using　pH　and　ORP　as　control　parameters,　to　improve　the　performance　of　the　AAS　process.　The　online　control　strategy　could　achieve　up　to　87%　of　the　total　nitrogen　(TN)　removal　efficiency　on　an　average,　and　saving　approximately　20%　aeration　energy,　as　compared　to　the　conventional　steady-state　control　systems.　Moreover,　stable　short-cut　nitrification　and　denitrification　were　successfully　achieved　with　an　average　nitrite　accumulation　ratio　of　above　95%.