A　novel　wastewater　treatment　technology　combining　a　sequencing　batch　biofilm　reactor　and　biological　filtration　in　an　SBBR-BF　system　was　presented.　Elastic　plastic　filaments　were　fixed　as　biofilms　carrying　media.　Particle　materials　(sand　or　anthracite)　and　the　settled　sludge　constituted　the　filtration　layer.　In　the　laboratory　studies,　operating　results　of　SBR,　SBBR　and　SBBR-BF　were　compared.　Better　quality　and　stable　water　quality　of　effluent　could　be　achieved　in　SBBR-BF　because　the　fixed　film　and　filtration　layer　were　added　in　the　reactor.　Other　laboratory　experiment　results　indicated　that　slow　filtration,　cycle　water　stirring　and　backwashing　making　use　of　the　settled　supernatant　are　successful　methods　for　preventing　clogging　and　saving　energy.　The　velocity　and　headloss　of　filtration　were　significantly　impacted　by　different　MLSS　concentration.　The　MLSS　concentration　in　the　reactor　must　be　less　than　1,400　mg/L　for　optimal　results.　The　average　velocity　of　filtration　ranging　from　0.6　to　1.0　m/h,　the　backwash　velocity　of　10-15　m/h　and　the　backwash　time　of　20　seconds　are　recommended　according　to　the　laboratory　experiment.　On-site　experiment　and　study　showed　that　SBBR-BF　is　a　stable　and　efficient　system　for　domestic　wastewater　treatment,　and　is　particularly　suited　for　small　wastewater　treatment　plants,　because　of　the　simple　operation　and　compact　installation.