To deposite the catalyst on proton exchange membrane by electroless deposition for PEMFC. Membrane was pretreated with stannous chloride solution (sensitization) and palladium cholride solution (activation), to increase the conductivity and active surface for chemical reaction. Hydrazine and sodiumtretaborohydride were used as a reducing agent for platinum deposition (0.25-1.0 mg/sq.cm). The percentage of platinum coating was constant when the deposition time greater than 60 min. Platinum coating on 2nd side was higher than that of the 1st side at ratio of platinum and reducing agent about 1:1. When ratio of platinum and reducing agent was higher than 1:2, platinum coating on the 1st and the 2nd side was the same. The mophology of platinum particle was investigated by the scanning electron microscopy (SEM). The efficiency of membrane electrode assembly (MEA) constructed by platinum electroless deposition was lower than that from commercial (Electrochem Co.,Ltd.). The impedance spectroscopy was carried out to analyzed the resistance of the prepared MEA in a range of frequency is 10[superscript -1]-10[superscript 4] Hz. It demonstrated the prepared MEA of this work showed higher resistance than that from commercial.