To　improve　the　inherent　design　shortcomings　of　the　traditional　anaerobic/anoxic/nitrification(A(2)N)　process,　a　modified　A(2)N　process　was　proposed.　The　modified　A(2)N　process　was　used　to　treat　real　municipal　wastewater　to　evaluate　the　nutrogen　removal　in　traditional　and　modified　process　and　the　effect　of　aeration　rate　in　hybrid　biofilm　reactor　on　the　modified　A(2)N　process　was　investigated.　The　result　showed　that　the　TN　removal　efficiency　was　81.9%　in　traditional　process.　The　satisfied　nutrient　removal　performance　was　achieved　when　the　modified　process　was　applied　with　bigger　aeration　rate　(0.1m(3).h(-1))　in　hybrid　bioflim　reactor.　The　ammonia　removal　efficiency　increased　to　nearly　100%　and　the　TN　removal　efficiency　increased　to　91.3%.　The　simultaneous　nitrification　and　denitrification　(SND)　is　maxmium　contribution　to　the　better　TN　removal　performance.　However,　with　increasing　the　aeration　rate　to　0.4　m(3).h(-1),　the　SND　was　destroyed　in　hybrid　biofilm　reactor.　It　concluded　that　the　modified　A(2)N　process　was　feasible　and　has　a　stable　and　satisfied　nutrient　removal　via　controlling　aeration　rate　in　the　hybrid　biofilm　reactor.