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Thin Film Composite (TFC) polyamide membranes were prepared by interfacially polymerizing secondary amide (piperazine) and highly hydrophilic aromatic primary amide (3,5-diaminobenzoic acid) with trimesoyl chloride onto the polysulfone support. The salt rejection and flux of these composite membranes were measured at various feed pressures. Incorporation of the 3,5-diaminobenzoic acid cause an increase in hydraulic permeance and flux but loss in the rejection of NaCl and Na2SO4. Higher concentration of 3,5-diaminobenzoic acid produced a loose and defected skin layer but small quantity of 3,5-diaminobenzoic acid can improved the flux and rejection of Na2SO4. The reaction between the 3,5-diaminobenzoic acid, piperazine and trimesoyl chloride was further confirmed using Fourier Transform Infrared (FTIR).