Magnetic field was applied in the filtration process of electrolytical solution system by ceramic membrane. The effect of several factors on the ion permeation ratio were investigated. As for sodium chloride solution, the permeate flux were not changed with magnetic filed action, but the ion permeate ratio increased in filtration process. The magnetic pole direction and increasing cross-flow velocity didn’t influence the separation performance. The effect of magnetic field on the sodium chloride filtration increased with increasing magnetic field strength, solution concentration and decreasing membrane pore size. The ion permeate ratio of calcium chloride solution and sodium sulfate solution also increased under magnetic field. The simulated suspension consisting of calcium carbonate particles and sodium chloride solution were ion cleaning of particle surface by membrane filtration. The magnetic field assisting filtration could increase the rate of cleaning ion especially for that of the lower particle concentration.