In　order　to　investigate　nitrification　characteristics　of　high-efficiency　embedded　filler　under　municipal　sewage,　polyvinyl　alcohol　(PVA)　was　used　to　immobilize　nitrifying　bacteria.　After　the　recovery　culture　in　the　laboratory,　the　experimental　study　on　the　adaptability　of　the　embedded　filler　to　the　hydraulic　retention　time　(HRT)　and　temperature　and　the　application　of　the　embedded　filler　in　municipal　sewage.　The　results　showed　that　the　efficiency　of　filler　reached　93.20　mg•(L•h)-1　eventually　after　recovery　culture.　Under　normal　temperature　conditions,　HRT　has　little　effect　on　the　nitrification　efficiency　of　embedded　filler;　temperature　has　a　significant　effect　on　nitrification　efficiency.　When　the　water　temperature　was　12,　the　ammonia　oxidation　rate　of　the　filler　was　up　to　30.70　mg•(L•h)-1.　Under　the　conditions　of　low　temperature　and　normal　temperature　of　municipal　sewage,　when　the　HRT　is　3　h　and　1　h　respectively,　the　influent　ammonia　was　completely　removed,　indicating　that　the　embedded　filler　is　completely　feasible　for　municipal　sewage　nitrification.　Scanning　electron　microscope　(SEM)　observations　showed　that　the　filler　had　good　porosity　inside　and　the　network　structure　was　obvious.　Quantitative　real-time　PCR　results　showed　the　number　of　bacteria　has　greatly　increased,　indicating　that　the　filler　provided　a　good　microenvironment　for　microorganisms.　©　All　Right　Reserved.