Polymer electrolyte membrane fuel cells (PEMFCs) are attractive as eco-friendly with highly energy efficient alternative energy sources for various applications. The proton exchange membrane (PEM) is a key component of membrane electrode assembly, which supports the catalyst layer and act as a barrier between the anode and cathode. PEMs such as peruorosulfonic acid (PFSA) based membranes, particularly Nafion, have been materials of choice due to their excellent proton conductivity under a fully humidified environment. The decrease in proton conductivity above 80°C hinders the use of Nafion for large scale applications. Thus research continually working to find alternatives to Nafion membrane. Results, aromatic polymers, such as polyether ether ketone (PEEK), polybenzimidazole (PBI), and polysulfone (PSF), have received significant consideration and which satisfy the operation requirements for fuel cell applications. The proton conductivities of these polymers are frequently lower than 0.001 S cm-1 and are not suitable for fuel cell operation. The sulfonation of these polymers can enhance the proton conductivity. As alternative to commercial polymeric membrane, we made an attempt to synthesized the hydrophilic and hydrophobic polymer composite membrane. The conductivity of the membrane was increased by post-sulfonation process. To improve the thermal and conductivity graphene oxide was composited with this polymer and the characteristics were tested. The results shows that the graphene oxide improves the proton conductivity and thermal stability of the membrane.