Abstract: Using five measurement tactics protocoled,the effects of membrane morphology,membrane fouling and concentration polarization on streaming potential were studied.Experimental results show that the compaction of microfiltration membrane can result in some morphological changes,hence in streaming potential variation.But this kind of change of ultrafiltration membrane is not obvious.Among the five measurement tactics used,reducing pressure step by step after compaction at higher pressure is the best.The research work also verified that charged ultrafiltration membrane could partially reject the salt in solution and the presence of concentration polarization and fouling influenced streaming potential.