This　article　adopts　the　strategy　of　adding　biochar　and　increasing　HRT　to　accelerate　the　performance　and　particle　morphology　recovery　of　anaerobic　ammonia　oxidation　granular　sludge　stored　at　room　temperature　for　68　days.　The　results　showed　that　biochar　accelerated　the　death　of　heterotrophic　bacteria,　shortened　the　cell　lysis　and　lag　period　of　the　recovery　process　by　4　days,　and　it　only　took　28　days　for　the　nitrogen　removal　performance　of　the　reactor　to　recover　to　the　original　level,　and　56　days　for　re-granulation.　Biochar　promoted　the　secretion　of　EPS　(56.96　mg　gVSS-1),　and　the　sludge　volume　and　nitrogen　removal　performance　of　the　bioreactor　remain　stable.　Biochar　also　accelerated　the　growth　of　Anammox　bacteria.　The　abundance　of　Anammox　bacteria　in　the　biochar　reactor　reached　38.76%　on　the　28th　day.　The　high　abundance　of　functional　bacteria　and　the　optimized　community　structure　of　biochar　made　system　(Candidatus_Kuenenia:　38.30%)　more　risk-resistant　than　control　reactor.