Using AC impedance measurement, this study proposed a method to investigate ion exchange membrane area resistances; a two-polar cell holds membrane immersed in electrolyte solution, area resistance was determined by the difference of electricity resistance measured with or without a membrane. The error can be minimized by using a parallel electricity resistance. This method was proofed reliable and effective by measuring area resistances of a cation or an anion exchange membranes in electrolyte solution, including aqueous sulfuric acid, sodium chloride, and the real electrolyte used in vanadium redox flow battery(VRB). The measured results revealed the various adsorption behaviors of cation and anion exchange membranes, and showed membrane area resistance dependence upon electrolyte solution concentration. This study will facilitate the development of ion exchange membranes and its application in renewable energy technology.