A bench-scale immersed microfiltration coupled with 50g/L PAC was developed to treat micro-polluted surface water (MPSW) under 10 and 20°C and the effects of temperatures on the performance and the membrane fouling were also investigated. The low temperature (10°C) delayed the time for the start-up by 9days and the complete nitrification by 10days. In the stable operation, two systems both had high NH 3 -N removal efficiency (above 90%) and better removal of organic matters (10% DOC, 5% UV 254 and 4% SUVA) at 10°C. Polysaccharides (SMP) were the main membrane fouling matters at low temperature (10°C) and low temperature (10°C) didn’t cause serious chemical irreversible membrane fouling.