In this work we used impedance spectroscopy (IS) and differential scanning calorimetry (DSC) techniques to study the polymer electrolyte poly(vinyl alcohol) - AgI –H2O. AgI and PVAL (Al-drich) were used to prepare the system with the salt/polymer mass fraction: x=0.096. We got membranes with thicknesses of 0.2 mm. The impedance spectroscopy studies were obtained from Hz to 10 9 Hz over the temperature range 22 to 65°C. The polymer electrolyte exhibited an ionic conductivity of the order 10 -3 Scm -1 at room temperature for the hydrated samples. The permittivity curves reveal two dielectric relaxations at around 10 6 and 10 9 Hz. The DSC results show for dry samples that the glass transition phase is no sensible to the AgI content and appears at around 75 o C. Two more phase transitions appear at about 150 and 200 o C corresponding to the superionic silver phase transition and the PVAL melting point, respectively