Conducting composites of polypyrrole(PPy) and poly(N-methylpyrrole) (PNMP) were prepared by electrochemical polymerization of the corresponding monomers at a platinum electrode surface in 0.036M tetrabutylammoniumdodecylsulfate(TBADS) / acetonitrile(ACN) electrolyte solution system. Two types of composites were prepared; PPy/PNMP bilayer composite films and monomer mixture conducting polymer composites of pyrrole and N-methylpyrrole. The composites were characterized by TGA, SEM and 4-probe meter. The composites exhibited different electric resistances and thermal stabilities depending on the preparation method of the conducting polymer composites. The PPy/PNMP bilayer composite films showed lower electric resistance (i.e. better electric conductivity) and higher thermal stability than any other composite films obtained in this work.