An　integrated　process　of　powdered　activated　carbon　(PAC)　and　ultrafiltration　(UF)　and　the　independent　UF　were　conducted　to　treat　a　micro-polluted　alga-rich　water.　Effects　of　the　two　treatments　on　pollutant　and　microcystin-LR　removal,　as　well　as　fouling　control　of　PAC,　were　investigated.　The　results　indicate　that　both　of　the　two　processes　can　remove　the　chlorophyll-a　effectively.　The　maturities　of　nitrosomonas　group　and　nitrobacteria　are　about　15　d　and　20　d,　respectively.　The　removal　efficiencies　of　DOC　and　UV254　for　the　PAC/UF　are　32.7%　and　23.8%,　and　those　of　the　independent　UF　process　are　11.5%　and　15.0%.　Therefore,　PAC　can　effectively　enhance　the　organic　removal　and　the　MC-LR　removal　increases　from　18.5%　to　43.0%　with　the　PAC　addition,　Moreover,　PAC　can　mitigate　the　membrane　fouling　of　UF　process　of　alga-rich　water.　The　integrated　process　of　biological　powdered　activated　carbon　and　UF　tends　to　be　a　both　economical　and　efficient　technology　for　the　treatment　of　MC-LR.