Abstract: Conducting polyaniline depended on environmental temperature. In order to determine the effect of temperature on polyaniline, polyanuline was electrosynthetized by the cyclic voltmmetric method in sulfuric acid. The thermal decomposition temperature ofpolyaniline was determined to be 285.7℃ by TAG. The thermal lifetimes were tested by the isothermal TG for regression of the lifetime equations at various weight-loss ratios of 5%, 7% and 10%. IR spectra showed that the characteristic absorption shifted to a higher number with increasing temperature, which was caused by the decreasing conjugate structure of polyaniline.