Two different composite collodion membranes were prepared to examine the correlation of material transport to membrane charges or membrane structure from comparative study. One is a composite collodion membrane incorporating only perfluorobenzoic acid (PFBA) and the other is the same membrane but with pores formed by adding NaClO4. The membrane parameters defined by irreversible thermodynamic consideration such as filtration coefficient of water, salt permeability and reflection coefficient were estimated. The differences between two membranes or the dependence of membrane transports on salt species were discussed on the basis of the frictional coefficients between water-membrane skeleton or salt-water interactions.