In　this　work,　a　novel　integrated　anoxic/oxic　biofilm　reactor　was　proposed　to　treat　rural　domestic　sewage　with　low　carbon　to　nitrogen　(C/N)　ratio.　Effects　of　internal　recycle　(R)　on　pre-denitrification　and　biomass　production　in　anoxic　zones　of　the　integrated　reactor　were　mainly　investigated　to　tap　the　potentials　of　efficiency　and　economy.　The　experimental　results　obtained　during　a　98-day　period　showed　that:　the　nitrogen　removal　efficiencies　of　69.3%,　74.6%,　79.2%,　80.1%　on　average　were　realized　under　R　of　200%,　250%,　300%,　350%,　respectively.　Relatively　long　anoxic　hydraulic　retention　time　(7.2　h)　promoted　the　utilization　of　easily　biodegradable　carbon　source　in　influent　and　facilitated　the　occurrence　of　endogenous　denitrification　by　heterotrophic　denitrifying　bacteria,　which　lowered　the　anoxic　observed　sludge　yield　to　simplify　the　wasted　sludge　disposal.　For　practical　application　in　rural　areas,　R　of　250-300%　was　appropriate　with　respect　to　a　comprehensive　consideration.