The　combined　process　of　coagulation　sedimentation　and　powdered　activated　carbon　(PAC)　addition　in　immersed　ultrafiltration　was　used　to　treat　Beijiang　water　for　about　70　days　continuous　running.　Effects　of　different　PAC　dosages　on　removal　of　turbidity,　UV254,　CODMn,　and　membrane　fouling　were　investigated,　including　the　effect　of　retention-time　on　membrane　fouling　recovery.　Results　indicated　that　PAC　could　increase　organic　matters　removal　effectively,　UV254　removal　increased　to　27.00%,　43.17%　and　52.97%,　and　CODMn　removal　increased　to　6.70%,　20.91%　and　22.98%　at　the　dosage　of　5,　10　and　20　mg/L,　however,　the　function　decrease　gradually　during　24　h　after　dosing.　PAC　addition　have　an　effect　on　mitigating　membrane　fouling　at　the　same　time.　It　could　meet　the　demand　of　economics　and　effluent　quality　at　the　dosage　of　5-10　mg/L.　When　cleaning　the　fouled　membrane　with　NaClO,　the　membrane　flux　could　recover　at　the　retention　time　of　4-6　h.