PVDF/ PES-C blend membranes were prepared via TIPS method by using DBP and DMAc as mixed diluents. The effect of coagulation temperature on membrane structure and property were examined. The membrane structure was observed through SEM and pure water flux was tested. The crystal property of membrane was examined with DSC and XRD method. The waste water treatment property was also checked by using the membrane in MBR. Both the highest melting temperature and the content of α crystal form in blend membrane increased along with the increase of coagulation temperature. A thinner skin layer and a porous support layer formed when the coagulation temperature was 25℃. At this temperature, the pure water flux and sewage flux had a maximum value and the MBR remove ratio of COD and NH4 -N reached the discharge standard.