SINCE RECENT DECADES, MANY STUDIES HAVE BEEN CARRIED OUT ON CONDUCTING POLYMERS (CPS). THIS CLASS OF NOVEL SOLID-STATE MATERIALS WITH EXTENDED P-CONJUGATION ALONG THE POLYMER BACKBONE HAVE INDICATED ELECTROCHROMIC AND SEMICONDUCTING BEHAVIOR [1]. MUCH EFFORT IS DEVOTED TO RESEARCH ON SUCH SYSTEMS, BECAUSE OF MANY POTENTIAL APPLICATIONS IN VARIOUS FIELDS SUCH AS ANTI-STATIC COATINGS, ORGANIC LIGHT EMITTING DIODES, BATTERIES, BIOSENSORS, TOUCH SCREENS AND ELECTROCHROMIC DEVICES. IN THIS STUDY, A SIMPLE AND ECONOMIC METHOD IS USED FOR THE PRODUCTION OF A NEW COMPOSITE FILM BASED ON ANILINE IN THE PRESENCE OF MAGNESIUM OXIDE BY ELECTRODE POSITION ON ITO-COATED GLASS ELECTRODES. ELECTROCHEMICAL AND ELCTROCHROMIC BEHAVIORS OF THIN FILMS WERE EXAMINED BY CYCLIC VOLTAMMETRY (CV). UV-VIS SPECTROPHOTOMETER WAS USED TO STUDY THE OPTICAL TRANSMITTANCE OF THIN FILMS. THE DOPED FILMS INDICATED MULTIPLE COLOR CHANGES (YELLOWGREEN-BLUISH GREEN). THE OPTICAL SWITCHES WERE FAST AND FULLY REVERSIBLE. THE SPECTRA ALSO SHOWED THAT PRODUCED LAYER HAS HIGH ABSORPTION OF UV RADIATION TOWARDS PURE POLYANILINE (PANI) FILMS. BECAUSE OF ITS GOOD TRANSPARENCY, ELECTROCHROMIC BEHAVIOR AND ADHESION, IT CAN BE SUGGESTED AS A PROMISING MATERIAL FOR ELECTROCHROMIC DEVICES.