Conducting composite films have been obtained by the exposure of polyvinylic alcohol (PVA) film containing an oxidizing agent (FeCl(3.)6H2O) to pyrrole vapors. A parametric study has been investigated in order to synthetize homogeneous films in a reproductive manner. Taking PV A solubility in water into account, our study has been made according to two different parameters: -the water concentration in the pyrrole solution during the polymerization -the hygroscopic degree of substrate storage of the PV A-FeCl3 films.