Ultrafiltration　of　Binxian　reservoir　(near　Harbin　in　China)　water　to　produce　drinking　water　was　investigated　in　this　study.　Membrane　flux　declined　with　temperature　coming　down.　Using　coagulation　before　UF　not　only　increases　the　permeate　flux,　but　also　retards　the　permeability　decline.　In　comparison　to　the　normal　backwashing　in　which　flow　is　reversed　across　the　membrane　once　during　each　backwash　cycle,　two　consecutive　backwashing　pulses　during　each　cycle　is　an　optimized　operation.　A　chemical　cleaning　may　be　required　to　restore　the　initial　performance　of　the　membrane　when　the　fouling　occurs.　As　for　Binxian　reservoir　water,　0.1%　citric　acid　is　a　proper　cleaning　solution.　Membrane　filtration　offers　fewer　coagulation　agents　needed　and　good　quality　of　produced　water.