The high electrical conductivity and stability of electrochemical oxidative polypyr-roles are potentially attractive systems．So far．the real chemical structure is still ob-scure to us．The chemical structure and electrical properties of polypyrroles prepared by elec-trcIchemical oxidation in different sollvents and supporting electrolytes with various elec-trodes have been observed．Structure charaeterization was done by IR．XPS，X-ray diffraction，elemental analysis and electron microscopy．The room temperature con-ductivities of the fi]ms inereased 10—20 times after exposure to air．The temperature dependenee of conductivity was measured byVSC method that showed the metMlie ehara-cter of the polymer．IR spectra showed no N-H absorption，bult CH2 absorption ap-peared．We suggest there are pyrrolidone end groups in the polymer chains，and bran-ching or crosslinking happend to the polymer．XPS of the films showed that the dis-tribution of positive charge of pyrrole ring are different between BF-4 doped and other anion doped samples．The films are amorphous with small degree of crastallinity．The films showed electric switching effect．