Operating　effects　of　powered　activated　carbon　combined　with　ultrafiltration　was　investigated,　based　on　the　status　with　low　removal　rate　to　organic　matters　and　serious　pollution　of　ultrafiltration　membrane.　Combined　pilot-scale　treatment　process　of　powered　activated　carbon　and　ultrafiltration　(PAC-UF)　was　applied　to　treat　micro-polluted　raw　water.　The　removal　effects　of　turbidity　and　organics　on　PAC-UF　combined　process　and　UF　process　were　compared.　The　effects　on　pollutant　removal　and　UF　operation　performance　were　studied　with　different　PAC　dosages.　The　results　show　that　the　organics　removal　efficiency　of　UF　process　combined　with　PAC　is　obviously　improved.　The　average　removal　rate　of　CODMn　and　UV254　are　both　above　56%,　and　higher　with　the　PAC　dosage　increased.　The　turbidity　removal　rate　of　PAC-UF　process　is　very　high.　The　effluent　turbidity　of　PAC-UF　process　is　higher　slightly　than　that　of　UF　process,　and　is　higher　with　the　PAC　dosage　increased,　but　is　below　0.20NTU　totally.　Membrane　pollution　could　be　lessened　effectively　by　PAC　addition.　The　increase　of　transmembrane　pressure　is　slower　down　with　PAC　dosage　increased.　But　it　is　existed　the　optimum　PAC　dosage.　The　membrane　pollution　is　aggravated　by　over-dosaged　PAC.　The　PAC　dosage　of　10　g/L　is　the　optimum　value　in　the　study.