Nitrite　supply　was　pretty　significant　to　exogenous　or　endogenous　partial　denitrification　(ExPD　or　EdPD)　for　their　combination　with　anammox　in　removing　nitrogen.　This　study　investigated　how　temperature　impacted　the　nitrite　supply　of　ExPD　and　EdPD,　through　long-term　experiments　in　two　10　L　sequencing　batch　reactors　(SBRs)　and　12　batch　temperature　tests,　with　sodium　acetate　as　organic.　It　was　demonstrated　that　low　temperature　(5-15　degrees　C)　favored　higher　nitrite　transformation　rate　(NTR)　for　two　systems　(1.1-1.3　and　1.1-1.2　times　higher　separately),　and　ExPD　owned　higher　nitrite-supply　ability　than　EdPD　(32.8　%　higher　NTR).　Moreover,　quantitative　reverse　transcription　PCR　and　16srDNA　sequencing　were　conducted,　exploring　the　inherent　mechanism　and　microbial　dynamics.　Results　presented　that　more　inhibition　to　transcription　and　translation　of　nirSK　genes　than　narG　in　low　temperature　induced　higher　NTR.　Besides,　compared　with　ExPD,　less　microbial　dynamics　and　granule　size　reduction　occurred　to　EdPD,　which　was　more　capable　of　adapting　to　low　temperature.