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Various textile fibers in yarn forms were treated with aniline at different oxidative polymerization conditions to improve their electrical conductivities. In addition to the measurement of the ELECTRICAL RESISTANCE, surface texture and fiber cross-sections were examined by an optical and a scanning electron microscope. Attenuated total reflection infra-red spectroscopy was used to detect the formation of POLYANILINE on the surface of fibers. An attempt was made to correlate the perceived colour of the treated samples via visible light reflection spectroscopy with ELECTRICAL RESISTANCE. At proper condition of treatment, POLYANILINE formed on the surface of fibers improve the yarns CONDUCTIVITY. The decreases of ELECTRICAL RESISTANCE in nylon, cotton and acrylics were found to be more than polyester and wool yarns. The changes in the mechanical properties of yarns after treatment were insignificant. The stability of different COATING processes of POLYANILINE on the surface of cotton and acrylic yarns were compared. It goes further to explain the results based on the pertinent literature.