Abstarct: Direct methanol fuel cell has advantage of simpler design and operation; it has found several applications including portable electronic, distributed energy and transportation. Typically, polymer membrane such as Nafion is extensively used in DMFC, due to their excellent chemical thermal stability and mechanical properties in addition to their high proton conductivity. But high rate methanol crossover is seen in DMFC. One way to reduce methanol crossover from the membrane, is incorporating materials such as Zeolite. Zeolite can be a good candidate to be used as electrolyte in proton exchange membrane fuel cells, tacking advantage of higher chemical and thermal stability and specific adsorption properties. Impedance spectroscopy has been used to study proton conductivity, of the prepared Nafion 117 membrane. Composite membrane consisting zeolite HA and Nafion 117 was prepared by solution casting method. The external surface of the zeolite was functionalized in order to improve the interface bonding between Nafion ionomer and zeolite crystals. By incorporating the nanosized functionalised zeolite HA, methanol permeability of the composite membrane is reduced as much as 69%. The effect of temperature on methanol permeability of the membrane was investigated. Our results show a good compability with the reported work on Nafion membrane.