Abstract：A review of four main membrane fouling mechanism analysis methods, such as using the constant pressure law, analyzing the component of resistance, observing and monitoring the membrane fouling process, and using the numerical calculation method was given. It is proposed that although these existing researches are aimed at fields such as food, medicine, water treatment, air filtration and so forth, but they are the same in physical process, the separation of solid-liquid two phase flow.Therefore they are still significant as a reference for studying hydraulic system oil solid particle contamination level testing micro-pore filter membrane fouling mechanism, and meantime, they are inspiration to study the filtration and separation mechanism of the solid-liquid two phase flow, the membrane fouling mechanism and so on.

Keywords: micro-pore membrane; contamination level testing; membrane fouling mechanism; membrane filtration mechanism