To　achieve　stable　advanced　nitrogen　removal　via　nitrite　in　SBR,　factors　influencing　pH　variation　in　treating　real　domestic　wastewater　were　investigated.　The　characteristic　points　were　found　to　be　appeared　obviously　on　pH　profile　at　both　ends　of　ammonia　oxidization　and　denitrification　by　analyzing　the　mechanism　of　biological　nitrogen　removal　and　the　balance　of　carbonic　acid.　Using　pH　as　control　parameter　in　SBR　for　treating　domestic　or　municipal　wastewater　with　low　organic　concentration　and　suitable　alkalinity　could　achieve　advanced　nitrogen　removal　with　effluent　TN　below　1　mg/L.　Moreover,　it　could　prevent　the　decrease　of　nitrite　accumulation　rate　causing　by　excessive　aeration,　which　plays　an　important　role　on　the　stability　of　advanced　nitrogen　removal　via　nitrite.　Based　on　theoretical　analysis　and　experimental　study,　the　real-time　control　strategy　of　advanced　nitrogen　removal　via　nitrite　was　established.　To　accommodate　the　different　water　quality　and　retain　the　accuracy　of　control　strategy,　18　adjustable　variables　were　set　up　in　control　strategy.　The　control　strategy　established　a　foundation　for　developing　control　software　and　control　system　of　advanced　nitrogen　removal　via　nitrite.