Effect of percent of Nafion membrane N (%) and Relative Humidity of the Cathode RHC (%) on cell performance in various compression of membrane at various pressure was analyzed in Polarization curves. Changing in N (%) between 20% and 25%, RHC (%) between 30, 50, 80 and 100%, P between 5, 15 and 25 psig, and membrane compression percent (%) lead to change the value of voltage and power density per current density. From each polarization curve, in table (1-2) and figure (1-2), an example of data extracted from the curve and related polarization curve presented, respectively.