The magnetic suspensible particles was put into MBR, the membrane fouling was controlled through improving the feature of sludge.The result indicated that the optimum absorbent is De/Fe3O4and composite particles of diatomite, the optimum volume of absorbent is 0.1g/L. The fouling rate of MBR which with suspensible magnetic composite particles (De/Fe3O4) is lower than the one without any particles. The MBR with particles removes the extracellular polymers (EPS) in the mixed liquid of sludge effectively, and increases the sludge particle size, then improves the mixed liquid characteristics, which could delay the growth of TMP and control the membrane fouling, reduce the frequency of cleaning and the cost of operating.