This　research　adopted　the　(35±1)　temperature　and　pH　were　acidity　(pH=4.0,　5.0,　6.0)　and　alkaline　(pH=8.0,　9.0,　10.0)　conditions　to　conduct　waste　activated　sludge　anaerobic　fermentation,　using　an　equal　volume　of　different　fermentation　liquid　as　carbon　source　researched　its　effect　on　NOx-　reduction　process.The　results　showed　that:　when　the　fermentation　liquid　produced　in　pH=8.0　condition　as　carbon　source,　the　highest　reaction　rate　appeared,　NO3-　and　NO2-　reduction　rate　respectively　were　16.28mg/(gVSS·h)　and　17.51mg/(gVSS·h).　The　NO2-　reduction　process　was　faster　than　the　NO3-　reduction　process　while　the　fermentation　liquid　as　carbon　source　produced　by　acidic　condition,　but　the　NO3-　reduction　rate　was　higher　when　the　fermentation　liquid　as　carbon　source　produced　by　alkaline　condition.　Meanwhile,　which　produced　the　nitrite　accumulation　phenomenon　among　the　denitrification　process,　the　accumulation　rate　of　nitrite　during　denitrification　process　reached　82.5%　when　the　fermentation　liquid　as　carbon　source　produced　in　pH=10.0condition.　©　2016,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.